cant和couldnt的區(qū)別
在請求或委婉表達(dá)時，could't 比 can't 更為委婉，更顯得禮貌。例如，在請求幫助時，可以說 "Could you please help me?" 而不是 "Can you please help me?"
而在一般陳述中，could't 用于過去時，表示過去的能力或情況，而 can't 用于現(xiàn)在時，表示當(dāng)前的情況或能力。例如，"I couldn't finish the task yesterday because of the sudden rain" 和 "I can't finish the task today because I have other commitments."
此外，could't 還可以用于假設(shè)性情況或條件句中，表示過去可能或不可能的情況。例如，在假設(shè)語句中可以說 "If I had known about the meeting, I could't have missed it."
總之，can't 和 couldn't 在表達(dá)否定推測和委婉請求時，有著微妙的區(qū)別。通過理解這些區(qū)別，我們可以在不同的語境中更加準(zhǔn)確地使用這兩個詞。
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相關(guān)評說：
隆化縣滾道： ______ 1,可以.但是意思會發(fā)生變化.用didn't是說,游戲很有意思,但我沒有玩得開心.只是對過去情況的一種陳述(我已經(jīng)玩過了,但沒能從中獲得樂趣).用can't是我卻玩不進(jìn)去(無法從中獲得樂趣).是一種狀態(tài).2,不能,前后兩句是因果關(guān)系(這個句子有語法錯誤,要加個連詞才可以,兩個完整的句子不可以直接用逗號連接.),用did意思不通.3,可以換成can't,但不能用did not.could 只是語氣委婉一點(diǎn).在沒有上下文的情況下,無法判斷是不是虛擬語氣,所以可以換.
隆化縣滾道： ______ couldnt do that=過去式 cant do that=現(xiàn)在式
隆化縣滾道： ______[答案] COULDNT是過去式 比CAN 更委婉.如果語氣不要那么強(qiáng)烈 可以用COULDNT
隆化縣滾道： ______ 前者用于一般過去式,后者是can;t的過去式,也可以表示委婉請求
隆化縣滾道： ______ can't是不可能的意思.例:I can't move that box because it is so heavy. don't是助動詞.例:I don't know. did't是don't的過去式,在一般過去式的句子中改否定句是常用到.例:He worked out this problem by himself.的否定句是He didn't work out this problem by himself. couldn't是can't的過去式.could也有時候表示委婉語氣.例:Could you give me that pen?
隆化縣滾道： ______ couldn't表示有禮貌的(有時用在建議中) 另外一個就是過去式了嘍.
隆化縣滾道： ______[答案] 1.can't 是“不可能”,強(qiáng)調(diào)可能性2.mustn't 是“不準(zhǔn),不允許”,是命令的口氣,語氣最強(qiáng)烈.3.shouldn't 是“(按常理來說)不應(yīng)該”,強(qiáng)調(diào)建議.4.needn't 是“不需要,不必要”,強(qiáng)調(diào)客觀條件5.might not 是“不可能”,比...
隆化縣滾道： ______ ＂can have done＂是一種情態(tài)動詞的過去完成時,表示過去某個時間點(diǎn)或動作之前已經(jīng)完成的動作.它是由“can”和“have done”兩部分組成的.其中,“can”是情態(tài)動詞,表示能力或許可;而“have done”是現(xiàn)在完成時的構(gòu)成形式,表示過去某個時間點(diǎn)或動作之前已經(jīng)完成的動作 .例如:- By the time I arrived, he could have finished his work.(到我到達(dá)的時候,他可能已經(jīng)完成了他的工作.)- She can have left already.(她可能已經(jīng)離開了.) ...
隆化縣滾道： ______ can't=cannot. 其實(shí)我覺得你的問題應(yīng)該是cannot 和can not 的區(qū)別.事實(shí)上,這兩個是不一樣的. Cannot是“不可以”,而can not是“可以不”. 舉個例子: I cannot ...
隆化縣滾道： ______ 1)在表示＂可能性＂方面can 、should 、may 、might這四個詞都可以用來表示＂可能性＂.但在表達(dá)的語氣和程度方面有所不同:can 和should表示以事實(shí)、理由為依據(jù)而存在的可能...
