文档介绍：,或从过去已经开始,持续到现在的动作或状态。现在完成时跨在两个时间之上,一是过去,一是现在。它的动作发生在过去,但对现在有影响(或结果),而这种影响(或结果)却往往是说话人的兴趣所在,所以常常后面不用时间状语。现在完成时所表的动作离说话人的说话时刻可近可远,表近距离的。
eg. The car has arrived. 车子来了。(结果:车子已在门口)
Someone has broken the window. 有人把窗户打破了。(结果:窗户仍破着)
现在完成时句子通常有recently,lately,since,for,in the past few months/years等词做时间状语。
肯定形式:have/has + done
否定形式:have/has + not +done
一般疑问句:have或has放于句首。
1)现在完成时所表示的动作在说话之前已完成,而对现在有影响。所以常常后面不用时间状语。现在完成时所表的动作离说话人的说话时刻可近可远。
eg. He has gone to London.
He has been to London.
2)现在完成时所表示的动作开始于过去,持续到现在,也许还会持续下去。常用for和since表示一段时间的状语或so far,now,today,this week (month,year)等表示包括现在时间在内的状语。
eg. He has studied English for 5 years.
He has studied English since 2001.
Now I have finished the work.
注意:表示短暂时间动作的词,e,go,die,marry,buy等的完成时不能与for,since等表示一段时间的词连用。用来持续的动作或状态或表过去重复的动作,如live,study,be,wait等,常和since(自从)或for(经历)引导的词语连用。如:I have lived here for more than thirty 。
3)现在完成时还可用在时间和条件状语从句中,表示将来某时完成的动作。
eg. I’ll go to your home when I have finished my homework.
If it has stopped snowing in the morning,we will go to the park.
现在完成时练****br/> 一、单项选择。
1、Both his parents look sad . Maybe they ______what's happened to him .
A. knew B. have known C. must know know
2、He has _______ been to Shanghai , has he ?A. already
3、Have you met Mr Li ______? A. just B. ago D.