精选优质文档-倾情为你奉上一般过去时与现在完成时区别专题与练习一、现在完成时1. 现在完成时的构成现在完成时是由助动词 have (has)+动词的过去分词构成。助动词说明该谓语是属于现在时范围。它和主语的人称、数要保持一致。过去分词是主要的谓语动词,说明句子的意义。 2. 现在完成时的用法现在完成时表示过去某时发生的行为对主语目前产生的影响。We are good friends.(现在的情况) I knew him in 1997.(过去的动作)We have known each other since 1997.(现在完成时把过去的动作和现在联系起来并着眼于现在)(1)表示动作发生在过去某个不确定的时间,但对现在留下了某种影响和结果。常被just、already、yet,twice, ever, never, three time 等副词修饰。如:-Have you had lunch yet?-Yes, I have. Ive just had it.I have been to Beijing twi