内容正文:
现在完成时
现在完成时:
have/ has +过去分词
1) 表示到现在为止已经完成或刚刚完成的动作。
Now we have planted all the trees.
He has just come back.
2) 表示过去发生的动作, 但强调结果或对现在的影响。
Have you had your supper?
I have read the book twice already.
在以上两种用法中常跟already, not…yet, never, just, before, ever, recently等时间继续下去的状语。
3) 表示过去已经开始, 持续到现在, 也许还会继续下去的动作或状态,常与包括现在在内的一段时间的状语连用。
He has studied English for 6 years.
Mary has been busy since she came back from Hangzhou..
过去分词的构成
1.直接加-ed。如:play-played
2.以字母e结尾的直接加d 。如:name-named
3.以辅音字母加y结尾的,变y为i加ed。如:carry-carried
4.重读闭音节且末尾只有一个辅音字母,双写这个辅音字母再加-ed。如:stop-stopped
现在完成时 Present perfect 句型
1.肯定句
现在完成时的肯定句式是“have(has)+过去分词”。
注意:该句式中的have或has是助动词,has用于第三人称单数,其它人称一律用have。
2.疑问句
现在完成时的一般疑问句式是把助动词have或has提到主语之前。 (回答用“Yes,...have(has)./“No,...haven’t(hasn’t).” )
3.否定句:现在完成时的否定句式是“haven't(hasn't)+过去分词”。
I have eaten my lunch.
She has eaten her lunch.
He has eaten his lunch.
肯定句
They have eaten their lunch.
I have not (haven’t) seen the film.
She has not (hasn’t) see