高中英语《Unit2 Robots》语法探究 新人教版选修7

Unit 2 Robots语法探究动词不定式（The Infinitive）1．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

Unit 2Robots 语法探究 动词不定式（The Infinitive） 1．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。 ①I 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） ②She 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 done ③The next thing to be done is to carry away the earth. 下一步要做的事是把 土运走。 ④No 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 write to be written 进行式 to be writing [ —— 完成式 to have written to have been writen 典型例题： The bank is reported in the local newspaper, in broad daylight yesterday. A. 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 1