1.should have done =ought to have done 本应该做而没做 2.would have done = 本来就会去做某事而没做 3.could have done = 本可以做某事而没做 4.might have done 本可以做而没做 例:They ought to have apologized. 他们本该道歉的。 5. must have done sth 一定做...
解析:根据句意,Tim Bemers-Lee创立万维网应该是过去的事情,而且be considered后面应该用动词不定式,所以应该用to have done,答案为A。 原则四、非谓语动词作定语时,表示将来用-to do,表正在进行用-ing,表示已经完成用-ed 例7. The play___ next month aims mainlyto r...
To do:表示动作在谓语动作之后或与其同时发生 To be doing:表示动作正在进行且与谓语动作同时发生 To have done:表示动作发生在谓语动词之前 Tips1: 有的动词不定式是带to的,但是还有一些是省略to的形式。比如固定句式中:had better do sth./would rather do sth./why...
常见形式有:to do、doing、done。一般而言,被动形式用done,主动形式用to do或者doing。例如: 1. As I approached mile 23, I could see my wifewaving a sign.(2018年北京卷)当我接近23...
C. You are not satisfied with what you have. D. You are not clearly aware of what you want. 12 A. As a principle for cooking. B. As a guideline for applying for a job. C. A...
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