精选优质文档-倾情为你奉上8A Unit 1 Past and presentGrammar 现在完成时现在完成时用来表示之前已发生或完成的动作或状态，但它的影响现在还存在；也可表示持续到现在的动作或状态。其构成： have (has) +过去分词。规则变化的过去分词与过去式的变化一样，在动词词尾加ed; 不规则变化的过去分词见不规则动词表，需要同学记忆。现以see the film为例将现在完成时的肯定句， 否定句和疑问句列表如下：肯定句：I/You/We/They have seen the film. He/She /It has seen the film.否定句：I/You/We/They have not/ havent seen the film. He/ She/It has not/hasnt seen the film.疑问句：Have I/you/they seen the film? Yes, you/ we/I/they have. No, you/ we/I/they havent
