2022年高中英语《Unit2 Robots》语法探究 新人教版选修7

2022年高中英语Unit2 Robots语法探究 新人教版选修71动词不定式的完成式（Perfect infinitive）由to+have+动词的过去分词构成。表示不定式的动作在谓语表示的动作（状态）之前完成。 I am sorry to have kept you waiting.对不起，叫你等了。（to have kept 发生在am所表示的时间之前）She seems to have read he book before.她好像看过这本书。（to have read发生在seems 所表示的时间之前）2动词不定式的被动语态。（Passive infinitive）.有两种形式：一般式 to be done.完成式 to have been doneThe next thing to be done is to carry away the earth. 下一步要做的事是把土运走。No harm seems to have been done.似乎并没有造成损害。动词不定式有下列时态和语态的变化：（以write为例）。 主动语态被动语态一般式to writeto be written进行式to be writing完成式to have writtento have been writenA. being robbed B. having been robbed C. to have been robbedD. robbed思维点击：由题意知：报道的是银行昨天在光天化日下被抢了，应用不定式的完成被动式来作主语补足语。参考答案：C