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新概念英语第一册语法:现在完成时

英语网整理 | 2012-09-04
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    现在完成时   构成:主语+助动词have, has+过去分词   用法:   1) 表示过去发生的和现在有某种联系的动作,常和just, usually, already, since等时间副词连用。   I have just had lunch. (饱了,不用再吃了。)   He has had a cup of tea.(不渴了,不用再喝。)   They have already had their holiday. (不能再度假了。)   The boy has already read the book. (已经知道书的内容了,不用再看了。)   2) 询问别人是否做过某事一般用现在完成时:   Have you finished your homework?   Have you been to Beijing?   Have he seen the film?   3) 表示开始于过去并持续到现在的动作   I have lived in Beijing for twenty years.   I have worked for this school for 1 year.   4) 表示一种经历,经验:去过…地方,做过…事情,经历过…事情   I have never had a bath.   I have never seen a film.   I have never been to cinema.   I have ever been to Paris.   Have been to表示去过,have gone to 表示去了   I have been to London.(人已经回来)   He has gone to London.(人还在那里)  
    5) 表示一种结果, 一般不和时间副词联用   I have lost my pen.   I have hurt myself.   He has become a teacher.   She has broken my heart.   句型变化:   ★变疑问句将助动词移到句首,变否定句在助动词后面加not.   Have you lost your pen? I have not lost my pen.   ★肯定回答及否定回答   Yes, I have. / No, I have not.   ★特殊疑问句   What have you done?   What has he done?   一般过去时与现在完成时的区别:   凡是有明确的表示过去的时间状语的句子为过去时。   注意:有些动词表示的动作有一个终点,不能再延续,因此不能和表示一段时间状语连用。   错:I’ve left Beijing for 3 days.   对:I left Beijing 3 days ago. I have been away from being for 3 days.
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