would/could /should/needn't+have done 表示本來……實際卻沒有
本來想要/能夠/應該/不必做某事 而實際上卻相反
must/may/might/can't+have done表示對過去發(fā)生的情況進行推測
過去一定是/可能是/也許是/一定不是
should to do/ shouldn't to do不存在
這些詞都是情態(tài)動詞 后面要么加動詞原形 要么加have done那oughtn't to have done和oughtn't to do呢？oughtn't to have done屬于第一類 ought to是情態(tài)動詞詞組 意義與should相同 這是否定形式 表示本來不應該做 實際上卻做了oughtn't to do=shouldn't do 不應該做某事 情態(tài)動詞的基本用法
can have done could have done should have done should to do shouldn't have done shouldn't to do
can have done could have done should have done should to do shouldn't have done shouldn't to do
還有
needn't have done
needn't do
mustn't have done
may not have done
might not have done
還有
needn't have done
needn't do
mustn't have done
may not have done
might not have done
英語人氣：229 ℃時間：2019-08-21 01:04:43
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