關(guān)于英語的情態(tài)動詞的用法(急!!!越快越好,盡量在兩天內(nèi)回答。好的再加分) 關(guān)于情態(tài)動詞的用法和練習,謝謝了
情態(tài)動詞是一種本身有一定的詞義,但要與不帶to的普通動詞的不定式一起使用,給謂語動詞增添情態(tài)色彩,表示說話人對有關(guān)行為或事物的態(tài)度和看法,認為其可能、應(yīng)該或必要等。
情態(tài)動詞后面加動詞原形。
[編輯本段]分類:
情態(tài)動詞有四類:
①只做情態(tài)動詞:must,can(could),may(might),ought to
②可做情態(tài)動詞又可做實義動詞:need,dare
③可做情態(tài)動詞又可做助動詞:shall(should),will(would)
④具有情態(tài)動詞特征:have(had) to,used to
[編輯本段]位置:
情態(tài)動詞在句中放在謂語動詞之前, 謂語動詞前若有助動詞,則在助動詞之前,疑問句中, 情態(tài)動詞則在主語之前。
I can see you. Come here.
我能看見你,過來吧。
He must have been away.
他一定走了。
What can I do for you?
我能幫你嗎?
How dare you treat us like that!
你怎能那樣對待我們!
[編輯本段]特點:
情態(tài)動詞無人稱和數(shù)的變化, 情態(tài)動詞后面跟的動詞需用原形,否定式構(gòu)成是在情態(tài)動詞后面加 "not"。 個別情態(tài)動詞有現(xiàn)在式和過去式兩種形式, 過去式用來表達更加客氣, 委婉的語氣, 時態(tài)性不強, 可用于過去,現(xiàn)在或?qū)怼G閼B(tài)動詞屬非及物動詞,故沒有被動語態(tài)。
He could be here soon.
他很快就來。
We can't carry the heavy box.
我們搬不動那箱子。
I'm sorry I can't help you.
對不起,我?guī)筒簧夏恪?
基本助動詞與情態(tài)助動詞最主要的區(qū)別之一是,基本助動詞本身沒有詞義,而情態(tài)助動詞則有自己的詞義,能表示說話人對有關(guān)動作或狀態(tài)的看法,或表示主觀設(shè)想:
What have you been doing since? (構(gòu)成完成進行體,本身無詞義)
I am afraid I must be going. (一定要)
You may have read some account of the matter. (或許已經(jīng))
除此之外,情態(tài)助動詞還有如下詞法和句法特征:
1) 除ought和used以外,其他情態(tài)動詞后面只能接不帶to的不定式。如果我們把ought to和used to看做是固定詞組的話,那么,所有情態(tài)動詞無一例外地只能接不帶to的不定式:
We used to grow beautiful roses.
I asked if he would come and repair my television set.
2) 情態(tài)助動詞在限定動詞詞組總是位居第一:
They need not have been punished so severely.
3) 情態(tài)助動詞用于第三人稱單數(shù)現(xiàn)在時的時候,沒有詞形變化,即其詞尾無-s形式:
She dare not say what she thinks.
4) 情態(tài)動詞沒有非限定形式,即沒有不定式和分詞形式,也沒有相應(yīng)的動名詞:
Still, she needn't have run away.
5) 情態(tài)助動詞的“時”的形式并不是時間區(qū)別的主要標志。在不少場合,情態(tài)助動詞的現(xiàn)在時和過去時形式都可以表示現(xiàn)在、過去或?qū)頃r間:
Would you mind very much if I ask you to do something?
She told him he ought not to have done it.
6) 情態(tài)助動詞之間是相互排斥的,即在一個限定動詞詞組中只能出現(xiàn)一個情態(tài)助動詞,但有時卻可以與have和be基本助動詞連用:
You should have washed the wound.
Well, you shouldn't be reading a novel.
[編輯本段]用法
首先它是動詞,而且不同于行為動詞,行為動詞表示的是可以通過行為來表達的動作(如寫,讀,跑),而情態(tài)動詞只是表達的一種想法(如能,也許,敢)。
用法是:情態(tài)動詞+行為動詞原形
例句:I can read this sentence in English.
我能用英語讀這句話。
情態(tài)動詞是一種本身有一定的詞義,表示說話人的情緒,態(tài)度或語氣的動詞,但不能單獨作謂語, 只能和其他動詞原形構(gòu)成謂語。
We can be there on time tomorrow.我們明天能按時去那兒。
May I have your name? 我能知道你的名字嗎?
Shall we begin now?我們現(xiàn)在就開始嗎?
You must obey the school rules.你必須遵守校規(guī)。
情態(tài)動詞數(shù)量不多,但用途廣泛,主要有下列:
can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would),have (to) ,had better.
[編輯本段]功能
助動詞(auxiliary)主要有兩類:基本助動詞(primary auxiliary)和情態(tài)助動詞(modal auxiliary)。基本助動詞有三個:do, have和be;情態(tài)助動詞有十三個:may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to. 上述兩類助動詞的共同特征是,在協(xié)助主動詞構(gòu)成限定動詞詞組時,具有作用詞的功能:
1) 構(gòu)成否定式:
He didn't go and neither did she.
The meeting might not start until 5 o'clock.
2) 構(gòu)成疑問式或附加疑問式:
Must you leave right now?
You have been learning French for 5 years, haven't you?
3) 構(gòu)成修辭倒裝:
Nowhere can he obtain any information about his sister.
Hardly had he arrived when she started complaining.
4) 代替限定動詞詞組:
A: Who can solve this crossword puzzle?
B: Tom can.
A: Shall I write to him?
B: Yes, do.
[編輯本段]can和could的用法
1. 表示能力或客觀可能性,還可以表示請求和允許。如:
Can you finish this work tonight?
Man cannot live without air.
— Can I go now? — Yes, you can.
注意:①could也可表示請求,語氣委婉,主要用于疑問句,不可用于肯定句,答語應(yīng)用can(即could不能用于現(xiàn)在時態(tài)的簡略答語中)。如:
Could I come to see you tomorrow?
Yes, you can. (否定答語可用No, I'm afraid not.)
②can表示能力時,還可用be able to代替。如:
I'll not be able to come this afternoon.
2. 表示驚異、懷疑、不相信的態(tài)度。(主要用在否定句、疑問句或驚嘆句中)
Can this be true?
How can you be so careless!
This cannot be done by him.
3. “can(could) + have + 過去分詞”的疑問或否定形式表示對過去發(fā)生的行為懷疑或不肯定。如:
He cannot have been to that town.
Can he have got the book?
4. 用在疑問句及否定句中,表示驚訝,不相信等.
5. cannot```too\enough表示"無論怎樣``````也不過分","越``````越好"
[編輯本段]may和might的用法
1. 表示許可。
表示請求、允許時,might比may的語氣更委婉一些,否定回答時要用mustn't表示“不可以”、“禁止”、“阻止”之意。如:
You may drive the car.
— Might I use your pen? — No, you mustn't.
用May I ... 征詢對方許可在文體上比較正式,在口氣上比較客氣。在日常口語中,用Can I ... 征詢對方意見在現(xiàn)代口語中更為常見。
2. 用于祈使句中表示祝愿。如:
May you succeed!
3. 表示推測、可能(疑問句不能用于此意)。
He may be very busy now.
4. “may(might) + have + 過去分詞”表示對過去發(fā)生的行為的推測。如:
He may not have finished the work.
[編輯本段]must和have to的用法
1. 表示必須、必要。(must表示主觀多一些而have to則表示客觀多一些)如:
You must come in time.
回答must引出的問句時,如果是否定的回答,不能用mustn't,而要用needn't或don't have to。
— Must we hand in our exercise books today?
— Yes, you must. (No, you don’t have to.)
2. “must be + 表語”的結(jié)構(gòu)表示推測,它的否定或疑問式用can代替must。
This must be your pen.
3. “must + have + 過去分詞”的結(jié)構(gòu)常用在肯定句中,表示對過去發(fā)生的行為的推測。它的否定或疑問式用can代替must。
He must have been to Shanghai.
4. have to的含義與must相似,兩者往往可以互換使用,但have to有各種形式,隨have的變化而定。must與have to有下列幾點不同:
① must表示的是說話人的主觀看法,而have to則往往強調(diào)客觀需要。如:
The play is not interesting. I really must go now.
I had to work when I was your age.
② must一般只表現(xiàn)在,have則有更多的時態(tài)形式。
③ 二者的否定意義不大相同。如:
You mustn't go. 你可不要去。
You don't have to go. 你不必去。
④ 詢問對方的意愿時應(yīng)用must。如:
Must I clean all the room?
[編輯本段]dare和need的用法
1. need表示“需要”或“必須”,作情態(tài)動詞時,僅用于否定句或疑問句中,在肯定句中一般用must, have to, ought to,或should代替。如:
You needn’t come so early.
— Need I finish the work today?
— Yes, you must.
注意:needn't + 不定式的完成式“表示本來不必做某事而實際上做了某事”。如:
You needn't have waited for me.
2. Dare作情態(tài)動詞時,主要用于疑問句、否定句和條件從句中,一般不用在肯定句中。如:
How dare you say I'm unfair.
He daren't speak English before such a crowd, dare he?
3. Dare和need常用作實義動詞,有時態(tài)、人稱和數(shù)的變化,所不同的是,作實義動詞時,在肯定句中,dare后面通常接帶to的不定式,在否定和疑問句中,dare后面可接帶to或不帶to的不定式。如:
I dare to swim across this river.
He does not dare (to) answer.
Don't you dare (to) touch it!
I wondered he dare (to) say that.
He needs to finish it this evening.
[編輯本段]shall和should的用法
1. Shall用于第一人稱,表示征求對方的意愿。如:
What shall we do this evening?
2. Shall用于第一、第三人稱疑問句中,表示說話人征求對方的意見或向?qū)Ψ秸埵尽H纾?
Shall we begin our lesson?
When shall he be able to leave the hospital?
3. Shall用于第二、第三人稱,表示說話人給對方命令、警告、允諾或威脅。如:
You shall fail if you don't work harder. (警告)
He shall have the book when I finish reading. (允諾)
He shall be punished. (威脅)
4. Should表示勸告、建議、命令,其同義詞是ought to;在疑問句中,通常用should代替ought to。如:
You should go to class right away.
Should I open the window?
Should的含義較多,用法較活,現(xiàn)介紹三種其特殊用法。請看下面的句子:
① I should think it would be better to try it again. 我倒是認為最好再試一試。
② You are mistaken, I should say. 依我看,你是搞錯了。
③ I should advise you not to do that. 我倒是勸你別這樣做。
④ This is something I should have liked to ask you. 這是我本來想問你的。
從以上例句可以看出:情態(tài)動詞should用于第一人稱時可以表示說話人的一種謙遜、客氣、委婉的語氣。
Should還可以用在if引導(dǎo)的條件從句,表示一件事聽起來可能性很小,但也不是完全沒有可能。相當于“萬一”的意思。從句謂語由should加動詞原形構(gòu)成,主句謂語卻不一定用虛擬語氣。如:
⑤ Ask her to ring me up if you should see her. 你萬一見到她,請讓她給我打個電話。
⑥ If you should change your mind, please let us know. 萬一你改變主意,請通知我們。
⑦ Should I (If I should) be free tomorrow I will come. 萬一我明天有時間,我就來。
此外,Why(or How) + should結(jié)構(gòu)表示說話人對某事不能理解,感到意外、驚異等意思。意為“竟會”。如:
⑧ Why should you be so late today? 你幾天怎么來得這么晚?
⑨ — Where is Betty living? — 貝蒂住在哪里?
— How should I know? — 我怎么會知道呢?
⑩ I don't know why you should think that I did it. 我真不知道你憑什么認為這件事是我干的。
5. “should + have + 過去分詞”結(jié)構(gòu)一般表示義務(wù),表示應(yīng)該做到而實際上沒有做到,并包含一種埋怨、責備的口氣。如: She should have finished it.
I should have helped her, but I never could.
You should have started earlier.
[編輯本段]will和would的用法
1. 表示請求、建議等,would比will委婉客氣。如:
Would you pass me the book?
2. 表示意志、愿望和決心。如:
I will never do that again.
They asked if we would do that again.
The door won't open
3. 用“will be”和“will(would) + have + 過去分詞”的結(jié)構(gòu)表示推測,主要用于第二、三人稱。前者表示對目前情況的推測,后者表示對已經(jīng)完成的動作或事態(tài)的推測。如:
This will be the book you want.
He will have arrived by now.
The guests would have arrived by that time.
I thought you would have finished this by now.
4. Would可表示過去反復(fù)發(fā)生的動作或某種傾向。Would表過去習慣時比used to正式,并沒有“現(xiàn)已無此習慣”的含義。如:
The wound would not heal.
During the vacation he would visit me every week.
5. 表料想或猜想。如:
It would be about ten when he left home.
What would she be doing there?
I thought he would have told you all about it.
[編輯本段]ought to的用法
1. Ought to表示應(yīng)該。如:
You ought to take care of him.
2. 表示推測。注意與must表示推測時的區(qū)別:
He must be at home by now. (斷定他已到家)
He ought to be home by now. (不十分肯定)
This is where the oil must be. (比較直率)
This is where the oil ought to be. (比較含蓄)
3. “ought to + have + 過去分詞”表示過去應(yīng)做某事而實際未做。如:
You ought to have asked him (but you didn't).
這時,ought to和should可以互相換用。
注意:在美國英語中,ought to用于否定句和疑問句時,to可以省略。如:
Ought you smoke so much?
You oughtn't smoke so much.
[編輯本段]used to,had better,would rather的用法
1. Used to表示過去的習慣動作或狀態(tài),現(xiàn)在已不存在,在間接引語中,其形式可不變。如:
He told us he used to play football when he was young.
在疑問句、否定句、否定疑問句或強調(diào)句中,可有兩種形式:
疑問句
Did you use to go to the same school as your brother?
Used you to go to the same school as your brother?
否定句
I usedn't to go there.
I didn't use to go there.
Usedn't 亦可拼作usen't,但發(fā)音皆為[ju:znt]。
否定疑問句
Usen't you to be interested in the theatre?
Didn't you use to be interested in the theatre?
強調(diào)句
I certainly used to smoke, but it was a long time ago.
I certainly did use to smoke, but it was a long time ago.
其反意疑問句或簡略回答中,也有兩種形式:
She used to be very fat, didn't she? (正式)/ use(d)n't she? (口語)
Did you use to play chess? Yes, I did.
Used you to get up early in the morning? Yes, I did. (Yes, I used to.)
2. Had better意為“最好”,后接不帶to的不定式。如:
— We had better go now.
— Yes, we had (we'd better / we had better).
Hadn't we better stop now? (Had we better not stop now?)
I think I'd better be going. (用于進行時態(tài),表“最好立即”)
You had better have done that. (用于完成時態(tài),表未完成動作)
注:①had best與had better同意,但較少用。②You had better … 用于同輩或小輩,對長輩不可用。
3. Would rather意為“寧愿”,表選擇,后接不帶to的不定式。如:
I'd rather not say anything.
Would you rather work on a farm?
— Wouldn't you rather stay here?
— No, I would not. I'd rather go there.
由于would rather表選擇,因而后可接than。如:
I would rather work on a farm than in a factory.
I would rather watch TV than go to see the film.
I would rather lose a dozen cherry trees than that you should tell me one lie.
I'd rather you didn't talk about this to anyone. (句中的'd rather不是情態(tài)動詞,would在此是表愿望的實義動詞)
[編輯本段]can (could), may (might), 用法:
can (could) 表示說話人能,可以,同意,準許,以及客觀條件許可,could 為 can 的過去式。
Can you pass me the books?
你能給我遞一下書嗎 ?
Could you help me, please?
請問,你能幫助我嗎?
What can you do?
你能干點什么呢?
Can you be sure?
你有把握嗎?
can 和could 只能用于現(xiàn)在式和過去式兩種時態(tài),將來時態(tài)用 be able to 來表示。
He could help us at all.
他完全可以幫助我們。
With the teacher's help,I shall be able to speak English correctly.
由于老師的幫助,我將能準確地講英語。
may (might) 可以, 表示說話人同意,許可或請求對方許可。
You may take the book home.
你可以把書帶回家去.
May I come in?
我可以進來嗎?
May I use your dictionary?
我可以用你的詞典嗎?
You may put on more clothes.
你可以多穿點衣服.
He said he might lend us some money.
他說他可以借給我們一些錢。
may 否定式為 may not, 縮寫形式是 mayn't.
might 是may 的過去式, 有兩種用法, 一種表示過去式,一種表示虛擬語氣, 使語氣更加委婉, 客氣或?qū)赡苄缘膽岩伞?
He told me he might be here on time.
他說他能按時間來。
Might I borrow some money now.
我可以借點錢嗎?
He might be alive.
他可能還活著。
[編輯本段]must, need, ought to, dare (dared)用法
Must 必須,應(yīng)該,一定,準是, 表示說話人認為有必要做某事, 命令, 要求別人做某事以及對事物的推測。
must 用來指一般現(xiàn)在時和一般將來時, 過去式可用 have to 的過去式代替。
I must finish my work today. 我今天必須完成我的工作。
You mustn't work all the time. 你不能老是工作。
Must I return the book tomorrow? 我必須明天還書嗎?
After such a long walk, you must be tired. 走了這么長的路,你一定困了。
He must be the man I am looking for. 他一定是我要找的人。
He had to go because of somebody's calling him that day. 那天他要走是因為有人叫他。
must + have + 過去分詞,表示現(xiàn)在對過去事物的推測。
He must have told my parents about it.
他一定把這件事情告訴我父母親了。
He must have received my letter now.
他現(xiàn)在一定收到我的信了。
It's six o'clock already, we must have been late again.
已經(jīng)六點鐘了,我們一定又遲到了。
must 和 have to 的區(qū)別: must 表示說話人的主觀思想, have to 表示客觀需要。
You must do it now.
你必需現(xiàn)在就干。(說話人認為必須現(xiàn)在干)
I have to go now.
我得走了。(客觀條件必須現(xiàn)在走)
need 需要 多用在否定式或疑問句中.
Need I attend the meeting tomorrow?
我需要明天參加會議嗎?
You need not hand in the paper this week.
這一周你不必交論文。
need 是一個情態(tài)動詞, 他的用法完全和其他情態(tài)動詞一樣, 但 need 還可當作實義動詞使用, 這時 need 就象其他動詞一樣,有第三人稱,單復(fù)數(shù), 后面加帶 to 的動詞等特性。
I need a bike to go to school.
我上學需要一輛自行車。
Do you need a dictionary?
你需要詞典嗎?
She needs a necklace.
她需要一條項鏈。
needn't + have + 過去分詞 表示過去做了沒必要做的事情。
You needn't have taken it seriously.
這件事情你不必太認真。
dare 敢 多用在否定或疑問句中。
The little girl dare not speak in public.
小女孩不敢在公眾面前說話。
Dare you catch the little cat?
你敢抓小貓嗎?
dare 除用作情態(tài)動詞外,更多的是當實義動詞使用, 用法同實義動詞一樣,要考慮人稱,單復(fù)數(shù),時態(tài)等。
Do you dare to walk in the dark?
你敢黑夜走路嗎?
He doesn't dare to tell the teacher what happened that day.
他不敢告訴老師那天發(fā)生的事。
[編輯本段]ought,will ,Shall, should,have to
ought 應(yīng)當,應(yīng)該 后面跟帶有 to 的動詞不定式。
You ought to read these books if you want to know how to repair the motorcar.
如果你想知道如何修理汽車,你應(yīng)該讀這些書。
You ought to bring the child here.
你應(yīng)該把孩子帶來。
ought + to have done 句型。指過去動作,表示一件事情該做而未做。
You ought to have been here yesterday.
你昨天就應(yīng)該來。
ought not to have done 句型。表示一件不該做的事情卻做了。
You ought not to have taken the book out of the reading-room.
你不應(yīng)該把書帶出閱覽室。
will (would)決心,愿望。 would 為 will 的過去式,
可用于各人稱。
I'll do my best to catch up with them.
我要盡全力趕上他們。
I'll never do it again, that's the last time.
我再不會做那件事情了,這是最后一次。
He said he would help me.
他說他會幫助我。
will, would用于疑問句表示說話人向?qū)Ψ教岢稣埱蠡蛟儐?用 would 比 will 更婉轉(zhuǎn),客氣。
It's hot. Will you open the windows?
天氣太熱了,你能打開窗戶嗎?
Will you help me to work it out?
你能幫我解這道題嗎?
Would you like some coffee?
給你來點咖啡怎樣?
Shall, should表示命令,警告,允諾,征求,勸告,建議驚奇。
You should hand in the exercise book.
你應(yīng)該交作業(yè)本兒了。
This should be no problem.
這應(yīng)該沒問題。
Shall we go now.
我們現(xiàn)在可以走了嗎?
Why should I meet him?
為什么我要見他?
have to,不得不,必須,表示客觀條件只能如此, 而must 則表示主觀思想必須。
I have to go now.
我現(xiàn)在得走了。
I have to cook for my child.
我得給孩子做飯。
You must be here on time next time.
你下次一定要按時來。
We must go to get the timetable ourselves.
我們一定要自己去拿時刻表。
情態(tài)動詞有四類:
①只做情態(tài)動詞:must,can(could),may(might),ought to
②可做情態(tài)動詞又可做實義動詞:need,dare
③可做情態(tài)動詞又可做助動詞:shall(should),will(would)
④具有情態(tài)動詞特征:have(had) to,used to
[編輯本段]位置:
情態(tài)動詞在句中放在謂語動詞之前, 謂語動詞前若有助動詞,則在助動詞之前,疑問句中, 情態(tài)動詞則在主語之前。
I can see you. Come here.
我能看見你,過來吧。
He must have been away.
他一定走了。
What can I do for you?
我能幫你嗎?
How dare you treat us like that!
你怎能那樣對待我們!
[編輯本段]特點:
情態(tài)動詞無人稱和數(shù)的變化, 情態(tài)動詞后面跟的動詞需用原形,否定式構(gòu)成是在情態(tài)動詞后面加 "not"。 個別情態(tài)動詞有現(xiàn)在式和過去式兩種形式, 過去式用來表達更加客氣, 委婉的語氣, 時態(tài)性不強, 可用于過去,現(xiàn)在或?qū)怼G閼B(tài)動詞屬非及物動詞,故沒有被動語態(tài)。
He could be here soon.
他很快就來。
We can't carry the heavy box.
我們搬不動那箱子。
I'm sorry I can't help you.
對不起,我?guī)筒簧夏恪?
基本助動詞與情態(tài)助動詞最主要的區(qū)別之一是,基本助動詞本身沒有詞義,而情態(tài)助動詞則有自己的詞義,能表示說話人對有關(guān)動作或狀態(tài)的看法,或表示主觀設(shè)想:
What have you been doing since? (構(gòu)成完成進行體,本身無詞義)
I am afraid I must be going. (一定要)
You may have read some account of the matter. (或許已經(jīng))
除此之外,情態(tài)助動詞還有如下詞法和句法特征:
1) 除ought和used以外,其他情態(tài)動詞后面只能接不帶to的不定式。如果我們把ought to和used to看做是固定詞組的話,那么,所有情態(tài)動詞無一例外地只能接不帶to的不定式:
We used to grow beautiful roses.
I asked if he would come and repair my television set.
2) 情態(tài)助動詞在限定動詞詞組總是位居第一:
They need not have been punished so severely.
3) 情態(tài)助動詞用于第三人稱單數(shù)現(xiàn)在時的時候,沒有詞形變化,即其詞尾無-s形式:
She dare not say what she thinks.
4) 情態(tài)動詞沒有非限定形式,即沒有不定式和分詞形式,也沒有相應(yīng)的動名詞:
Still, she needn't have run away.
5) 情態(tài)助動詞的“時”的形式并不是時間區(qū)別的主要標志。在不少場合,情態(tài)助動詞的現(xiàn)在時和過去時形式都可以表示現(xiàn)在、過去或?qū)頃r間:
Would you mind very much if I ask you to do something?
She told him he ought not to have done it.
6) 情態(tài)助動詞之間是相互排斥的,即在一個限定動詞詞組中只能出現(xiàn)一個情態(tài)助動詞,但有時卻可以與have和be基本助動詞連用:
You should have washed the wound.
Well, you shouldn't be reading a novel.
[編輯本段]用法
首先它是動詞,而且不同于行為動詞,行為動詞表示的是可以通過行為來表達的動作(如寫,讀,跑),而情態(tài)動詞只是表達的一種想法(如能,也許,敢)。
用法是:情態(tài)動詞+行為動詞原形
例句:I can read this sentence in English.
我能用英語讀這句話。
情態(tài)動詞是一種本身有一定的詞義,表示說話人的情緒,態(tài)度或語氣的動詞,但不能單獨作謂語, 只能和其他動詞原形構(gòu)成謂語。
We can be there on time tomorrow.我們明天能按時去那兒。
May I have your name? 我能知道你的名字嗎?
Shall we begin now?我們現(xiàn)在就開始嗎?
You must obey the school rules.你必須遵守校規(guī)。
情態(tài)動詞數(shù)量不多,但用途廣泛,主要有下列:
can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would),have (to) ,had better.
[編輯本段]功能
助動詞(auxiliary)主要有兩類:基本助動詞(primary auxiliary)和情態(tài)助動詞(modal auxiliary)。基本助動詞有三個:do, have和be;情態(tài)助動詞有十三個:may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to. 上述兩類助動詞的共同特征是,在協(xié)助主動詞構(gòu)成限定動詞詞組時,具有作用詞的功能:
1) 構(gòu)成否定式:
He didn't go and neither did she.
The meeting might not start until 5 o'clock.
2) 構(gòu)成疑問式或附加疑問式:
Must you leave right now?
You have been learning French for 5 years, haven't you?
3) 構(gòu)成修辭倒裝:
Nowhere can he obtain any information about his sister.
Hardly had he arrived when she started complaining.
4) 代替限定動詞詞組:
A: Who can solve this crossword puzzle?
B: Tom can.
A: Shall I write to him?
B: Yes, do.
[編輯本段]can和could的用法
1. 表示能力或客觀可能性,還可以表示請求和允許。如:
Can you finish this work tonight?
Man cannot live without air.
— Can I go now? — Yes, you can.
注意:①could也可表示請求,語氣委婉,主要用于疑問句,不可用于肯定句,答語應(yīng)用can(即could不能用于現(xiàn)在時態(tài)的簡略答語中)。如:
Could I come to see you tomorrow?
Yes, you can. (否定答語可用No, I'm afraid not.)
②can表示能力時,還可用be able to代替。如:
I'll not be able to come this afternoon.
2. 表示驚異、懷疑、不相信的態(tài)度。(主要用在否定句、疑問句或驚嘆句中)
Can this be true?
How can you be so careless!
This cannot be done by him.
3. “can(could) + have + 過去分詞”的疑問或否定形式表示對過去發(fā)生的行為懷疑或不肯定。如:
He cannot have been to that town.
Can he have got the book?
4. 用在疑問句及否定句中,表示驚訝,不相信等.
5. cannot```too\enough表示"無論怎樣``````也不過分","越``````越好"
[編輯本段]may和might的用法
1. 表示許可。
表示請求、允許時,might比may的語氣更委婉一些,否定回答時要用mustn't表示“不可以”、“禁止”、“阻止”之意。如:
You may drive the car.
— Might I use your pen? — No, you mustn't.
用May I ... 征詢對方許可在文體上比較正式,在口氣上比較客氣。在日常口語中,用Can I ... 征詢對方意見在現(xiàn)代口語中更為常見。
2. 用于祈使句中表示祝愿。如:
May you succeed!
3. 表示推測、可能(疑問句不能用于此意)。
He may be very busy now.
4. “may(might) + have + 過去分詞”表示對過去發(fā)生的行為的推測。如:
He may not have finished the work.
[編輯本段]must和have to的用法
1. 表示必須、必要。(must表示主觀多一些而have to則表示客觀多一些)如:
You must come in time.
回答must引出的問句時,如果是否定的回答,不能用mustn't,而要用needn't或don't have to。
— Must we hand in our exercise books today?
— Yes, you must. (No, you don’t have to.)
2. “must be + 表語”的結(jié)構(gòu)表示推測,它的否定或疑問式用can代替must。
This must be your pen.
3. “must + have + 過去分詞”的結(jié)構(gòu)常用在肯定句中,表示對過去發(fā)生的行為的推測。它的否定或疑問式用can代替must。
He must have been to Shanghai.
4. have to的含義與must相似,兩者往往可以互換使用,但have to有各種形式,隨have的變化而定。must與have to有下列幾點不同:
① must表示的是說話人的主觀看法,而have to則往往強調(diào)客觀需要。如:
The play is not interesting. I really must go now.
I had to work when I was your age.
② must一般只表現(xiàn)在,have則有更多的時態(tài)形式。
③ 二者的否定意義不大相同。如:
You mustn't go. 你可不要去。
You don't have to go. 你不必去。
④ 詢問對方的意愿時應(yīng)用must。如:
Must I clean all the room?
[編輯本段]dare和need的用法
1. need表示“需要”或“必須”,作情態(tài)動詞時,僅用于否定句或疑問句中,在肯定句中一般用must, have to, ought to,或should代替。如:
You needn’t come so early.
— Need I finish the work today?
— Yes, you must.
注意:needn't + 不定式的完成式“表示本來不必做某事而實際上做了某事”。如:
You needn't have waited for me.
2. Dare作情態(tài)動詞時,主要用于疑問句、否定句和條件從句中,一般不用在肯定句中。如:
How dare you say I'm unfair.
He daren't speak English before such a crowd, dare he?
3. Dare和need常用作實義動詞,有時態(tài)、人稱和數(shù)的變化,所不同的是,作實義動詞時,在肯定句中,dare后面通常接帶to的不定式,在否定和疑問句中,dare后面可接帶to或不帶to的不定式。如:
I dare to swim across this river.
He does not dare (to) answer.
Don't you dare (to) touch it!
I wondered he dare (to) say that.
He needs to finish it this evening.
[編輯本段]shall和should的用法
1. Shall用于第一人稱,表示征求對方的意愿。如:
What shall we do this evening?
2. Shall用于第一、第三人稱疑問句中,表示說話人征求對方的意見或向?qū)Ψ秸埵尽H纾?
Shall we begin our lesson?
When shall he be able to leave the hospital?
3. Shall用于第二、第三人稱,表示說話人給對方命令、警告、允諾或威脅。如:
You shall fail if you don't work harder. (警告)
He shall have the book when I finish reading. (允諾)
He shall be punished. (威脅)
4. Should表示勸告、建議、命令,其同義詞是ought to;在疑問句中,通常用should代替ought to。如:
You should go to class right away.
Should I open the window?
Should的含義較多,用法較活,現(xiàn)介紹三種其特殊用法。請看下面的句子:
① I should think it would be better to try it again. 我倒是認為最好再試一試。
② You are mistaken, I should say. 依我看,你是搞錯了。
③ I should advise you not to do that. 我倒是勸你別這樣做。
④ This is something I should have liked to ask you. 這是我本來想問你的。
從以上例句可以看出:情態(tài)動詞should用于第一人稱時可以表示說話人的一種謙遜、客氣、委婉的語氣。
Should還可以用在if引導(dǎo)的條件從句,表示一件事聽起來可能性很小,但也不是完全沒有可能。相當于“萬一”的意思。從句謂語由should加動詞原形構(gòu)成,主句謂語卻不一定用虛擬語氣。如:
⑤ Ask her to ring me up if you should see her. 你萬一見到她,請讓她給我打個電話。
⑥ If you should change your mind, please let us know. 萬一你改變主意,請通知我們。
⑦ Should I (If I should) be free tomorrow I will come. 萬一我明天有時間,我就來。
此外,Why(or How) + should結(jié)構(gòu)表示說話人對某事不能理解,感到意外、驚異等意思。意為“竟會”。如:
⑧ Why should you be so late today? 你幾天怎么來得這么晚?
⑨ — Where is Betty living? — 貝蒂住在哪里?
— How should I know? — 我怎么會知道呢?
⑩ I don't know why you should think that I did it. 我真不知道你憑什么認為這件事是我干的。
5. “should + have + 過去分詞”結(jié)構(gòu)一般表示義務(wù),表示應(yīng)該做到而實際上沒有做到,并包含一種埋怨、責備的口氣。如: She should have finished it.
I should have helped her, but I never could.
You should have started earlier.
[編輯本段]will和would的用法
1. 表示請求、建議等,would比will委婉客氣。如:
Would you pass me the book?
2. 表示意志、愿望和決心。如:
I will never do that again.
They asked if we would do that again.
The door won't open
3. 用“will be”和“will(would) + have + 過去分詞”的結(jié)構(gòu)表示推測,主要用于第二、三人稱。前者表示對目前情況的推測,后者表示對已經(jīng)完成的動作或事態(tài)的推測。如:
This will be the book you want.
He will have arrived by now.
The guests would have arrived by that time.
I thought you would have finished this by now.
4. Would可表示過去反復(fù)發(fā)生的動作或某種傾向。Would表過去習慣時比used to正式,并沒有“現(xiàn)已無此習慣”的含義。如:
The wound would not heal.
During the vacation he would visit me every week.
5. 表料想或猜想。如:
It would be about ten when he left home.
What would she be doing there?
I thought he would have told you all about it.
[編輯本段]ought to的用法
1. Ought to表示應(yīng)該。如:
You ought to take care of him.
2. 表示推測。注意與must表示推測時的區(qū)別:
He must be at home by now. (斷定他已到家)
He ought to be home by now. (不十分肯定)
This is where the oil must be. (比較直率)
This is where the oil ought to be. (比較含蓄)
3. “ought to + have + 過去分詞”表示過去應(yīng)做某事而實際未做。如:
You ought to have asked him (but you didn't).
這時,ought to和should可以互相換用。
注意:在美國英語中,ought to用于否定句和疑問句時,to可以省略。如:
Ought you smoke so much?
You oughtn't smoke so much.
[編輯本段]used to,had better,would rather的用法
1. Used to表示過去的習慣動作或狀態(tài),現(xiàn)在已不存在,在間接引語中,其形式可不變。如:
He told us he used to play football when he was young.
在疑問句、否定句、否定疑問句或強調(diào)句中,可有兩種形式:
疑問句
Did you use to go to the same school as your brother?
Used you to go to the same school as your brother?
否定句
I usedn't to go there.
I didn't use to go there.
Usedn't 亦可拼作usen't,但發(fā)音皆為[ju:znt]。
否定疑問句
Usen't you to be interested in the theatre?
Didn't you use to be interested in the theatre?
強調(diào)句
I certainly used to smoke, but it was a long time ago.
I certainly did use to smoke, but it was a long time ago.
其反意疑問句或簡略回答中,也有兩種形式:
She used to be very fat, didn't she? (正式)/ use(d)n't she? (口語)
Did you use to play chess? Yes, I did.
Used you to get up early in the morning? Yes, I did. (Yes, I used to.)
2. Had better意為“最好”,后接不帶to的不定式。如:
— We had better go now.
— Yes, we had (we'd better / we had better).
Hadn't we better stop now? (Had we better not stop now?)
I think I'd better be going. (用于進行時態(tài),表“最好立即”)
You had better have done that. (用于完成時態(tài),表未完成動作)
注:①had best與had better同意,但較少用。②You had better … 用于同輩或小輩,對長輩不可用。
3. Would rather意為“寧愿”,表選擇,后接不帶to的不定式。如:
I'd rather not say anything.
Would you rather work on a farm?
— Wouldn't you rather stay here?
— No, I would not. I'd rather go there.
由于would rather表選擇,因而后可接than。如:
I would rather work on a farm than in a factory.
I would rather watch TV than go to see the film.
I would rather lose a dozen cherry trees than that you should tell me one lie.
I'd rather you didn't talk about this to anyone. (句中的'd rather不是情態(tài)動詞,would在此是表愿望的實義動詞)
[編輯本段]can (could), may (might), 用法:
can (could) 表示說話人能,可以,同意,準許,以及客觀條件許可,could 為 can 的過去式。
Can you pass me the books?
你能給我遞一下書嗎 ?
Could you help me, please?
請問,你能幫助我嗎?
What can you do?
你能干點什么呢?
Can you be sure?
你有把握嗎?
can 和could 只能用于現(xiàn)在式和過去式兩種時態(tài),將來時態(tài)用 be able to 來表示。
He could help us at all.
他完全可以幫助我們。
With the teacher's help,I shall be able to speak English correctly.
由于老師的幫助,我將能準確地講英語。
may (might) 可以, 表示說話人同意,許可或請求對方許可。
You may take the book home.
你可以把書帶回家去.
May I come in?
我可以進來嗎?
May I use your dictionary?
我可以用你的詞典嗎?
You may put on more clothes.
你可以多穿點衣服.
He said he might lend us some money.
他說他可以借給我們一些錢。
may 否定式為 may not, 縮寫形式是 mayn't.
might 是may 的過去式, 有兩種用法, 一種表示過去式,一種表示虛擬語氣, 使語氣更加委婉, 客氣或?qū)赡苄缘膽岩伞?
He told me he might be here on time.
他說他能按時間來。
Might I borrow some money now.
我可以借點錢嗎?
He might be alive.
他可能還活著。
[編輯本段]must, need, ought to, dare (dared)用法
Must 必須,應(yīng)該,一定,準是, 表示說話人認為有必要做某事, 命令, 要求別人做某事以及對事物的推測。
must 用來指一般現(xiàn)在時和一般將來時, 過去式可用 have to 的過去式代替。
I must finish my work today. 我今天必須完成我的工作。
You mustn't work all the time. 你不能老是工作。
Must I return the book tomorrow? 我必須明天還書嗎?
After such a long walk, you must be tired. 走了這么長的路,你一定困了。
He must be the man I am looking for. 他一定是我要找的人。
He had to go because of somebody's calling him that day. 那天他要走是因為有人叫他。
must + have + 過去分詞,表示現(xiàn)在對過去事物的推測。
He must have told my parents about it.
他一定把這件事情告訴我父母親了。
He must have received my letter now.
他現(xiàn)在一定收到我的信了。
It's six o'clock already, we must have been late again.
已經(jīng)六點鐘了,我們一定又遲到了。
must 和 have to 的區(qū)別: must 表示說話人的主觀思想, have to 表示客觀需要。
You must do it now.
你必需現(xiàn)在就干。(說話人認為必須現(xiàn)在干)
I have to go now.
我得走了。(客觀條件必須現(xiàn)在走)
need 需要 多用在否定式或疑問句中.
Need I attend the meeting tomorrow?
我需要明天參加會議嗎?
You need not hand in the paper this week.
這一周你不必交論文。
need 是一個情態(tài)動詞, 他的用法完全和其他情態(tài)動詞一樣, 但 need 還可當作實義動詞使用, 這時 need 就象其他動詞一樣,有第三人稱,單復(fù)數(shù), 后面加帶 to 的動詞等特性。
I need a bike to go to school.
我上學需要一輛自行車。
Do you need a dictionary?
你需要詞典嗎?
She needs a necklace.
她需要一條項鏈。
needn't + have + 過去分詞 表示過去做了沒必要做的事情。
You needn't have taken it seriously.
這件事情你不必太認真。
dare 敢 多用在否定或疑問句中。
The little girl dare not speak in public.
小女孩不敢在公眾面前說話。
Dare you catch the little cat?
你敢抓小貓嗎?
dare 除用作情態(tài)動詞外,更多的是當實義動詞使用, 用法同實義動詞一樣,要考慮人稱,單復(fù)數(shù),時態(tài)等。
Do you dare to walk in the dark?
你敢黑夜走路嗎?
He doesn't dare to tell the teacher what happened that day.
他不敢告訴老師那天發(fā)生的事。
[編輯本段]ought,will ,Shall, should,have to
ought 應(yīng)當,應(yīng)該 后面跟帶有 to 的動詞不定式。
You ought to read these books if you want to know how to repair the motorcar.
如果你想知道如何修理汽車,你應(yīng)該讀這些書。
You ought to bring the child here.
你應(yīng)該把孩子帶來。
ought + to have done 句型。指過去動作,表示一件事情該做而未做。
You ought to have been here yesterday.
你昨天就應(yīng)該來。
ought not to have done 句型。表示一件不該做的事情卻做了。
You ought not to have taken the book out of the reading-room.
你不應(yīng)該把書帶出閱覽室。
will (would)決心,愿望。 would 為 will 的過去式,
可用于各人稱。
I'll do my best to catch up with them.
我要盡全力趕上他們。
I'll never do it again, that's the last time.
我再不會做那件事情了,這是最后一次。
He said he would help me.
他說他會幫助我。
will, would用于疑問句表示說話人向?qū)Ψ教岢稣埱蠡蛟儐?用 would 比 will 更婉轉(zhuǎn),客氣。
It's hot. Will you open the windows?
天氣太熱了,你能打開窗戶嗎?
Will you help me to work it out?
你能幫我解這道題嗎?
Would you like some coffee?
給你來點咖啡怎樣?
Shall, should表示命令,警告,允諾,征求,勸告,建議驚奇。
You should hand in the exercise book.
你應(yīng)該交作業(yè)本兒了。
This should be no problem.
這應(yīng)該沒問題。
Shall we go now.
我們現(xiàn)在可以走了嗎?
Why should I meet him?
為什么我要見他?
have to,不得不,必須,表示客觀條件只能如此, 而must 則表示主觀思想必須。
I have to go now.
我現(xiàn)在得走了。
I have to cook for my child.
我得給孩子做飯。
You must be here on time next time.
你下次一定要按時來。
We must go to get the timetable ourselves.
我們一定要自己去拿時刻表。
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