雅思閱讀知識點：動詞不定式

1)雅思閱讀動詞不定式的構成：

主動態(tài)：一般式"to do";完成式"to have done";進行式"to be doing";完成進行式“to have been doing”
　　被動態(tài)：一般式"to be done";完成式“ to have been done"
　　否定式：not+不定式

2)雅思閱讀不定式的時態(tài)：

①不定式的一般式表示的動作與主句謂語動詞表示的動作同時發(fā)生或之后發(fā)生。
　　He seems to know her address.(：=It seems that he knows her address.)
　　I hope to see you again.(=I hope that I’11 see you again.)

②不定式的進行體表示的動作正在進行，與主句謂語動詞表示的動作同時發(fā)生。其用法主要有以下幾種情況：
　　a 常用在"appear，happen，pretend，seem，hope，promise"之后。
　　She pretended to be listening attentively.
　　Tom appeared to be living in this area.
　　I hope to be earning my living in a year’s time.(I hope 1 will/would be earning my living)
　　I promised to be waiting at the door when he came out.

b 常用在"believe，consider，suppose，think，know，report，say，understand"等動詞的被動式之后。

He is thought/known/believed/said/supposed to be living in this area = People think/know/ believe/ say/suppose that she is living abroad.[據(jù)認為(據(jù)知，據(jù)信，據(jù)說，據(jù)猜測)她住在國外。]
　　[注]“be supposed to”通常含有“應該”意思，表示一定的責任和義務，在雅思閱讀中出現(xiàn)的很多。

You are supposed to know how to use a computer=You should know how to use a computer.
　　You are supposed to have been studying=You should have been studying.
　　Students are not supposed to cook in their dormitory=Students shouldn’t cook in their dormitory.

以上就是對于動詞不定式這一雅思閱讀知識點的相關介紹，考生朋友在閱讀的過程中注意一下，最后祝大家都能考出好成績。