英语四级要考哪些内容 英语四级语法基础知识必备（04）

英语四级语法基础知识必备（04）  

Ⅱ 非谓语动词,不定式,形式,主动形式 被动形式,一般式to do to be done,完成式to have done to have been done,进行式to be doing,完成进行式to have been doing,完成式: 不定式的一般形式所表示的动作, 通常与主要谓语表示的动作(状态)同时(或几乎同时)发生, 或是在它之后发生. 假如不定式所表示的动作, 在谓语所表示的动作(状态)之前发生, 就要用不定式的完成式。,I am glad to have seen your mother (= I am glad I have seen your mother).,(比较: I am glad to see you.),He is said to have written a new book about workers.,He pretended not to have seen me.,进行式: 如果主要谓语表示的动作(状态)发生时, 不定式表示的动作正在进行, 这时要用不定式的进行式。,You are not supposed to be working. You haven't quite recovered yet.,We didn't expect you to be waiting for us here.,He pretended to be listening attentively.,完成进行式: 在谓语所表示的时间之前一直进行的动作, 就要用不定式的完成进行式.,The struggle was known to have been going for enty years.,We are happy to have been working with you.