⑥ I can’t find my keys. I may / might have left them at the school yesterday.
could have done 在肯定句型中, 往往用作委婉的批评. 本应该做什么,而没做; 有时也用作猜测。例如:
⑦ You could have told us earlier.
⑧ Tom could have taken the dictionary.
ought to / should have done和 ought not to / shouldn’t have done用于对已发生的情况表示“责备”、“不满”,分别表示“本应该…”和“本不应该…”。例如:
⑨ With all the work finished, I should have gone to the party last night.
⑩ You ought not to have made fun of him. He is not the one you laugh at but learn from.
needn’t have done 表示过去做了某事,但没有做的必要, 意为“本没必要…”。例如:
⑾ You needn’t have waken me up; I don’t have to go to work today.
【注意】表示推测过去某动作发生的可能性时,就表示的可能性程度而言,must最大,could其次,may更次之,might最小。例如:
⑿ ---I wonder how Tom knew about your past.
---He must / could / may / might have heard of it from Mary.
2) 情态动词+动词进行式
情态动词+行为动词进行式(即情态动词+ be + doing形式),表示推测或评论某动作现在是否正在进行。例如:
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