文档介绍：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 e 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
-ed。如:play-played
。如:name-named
,变y为i加ed。如:carry-carried
,双写这个辅音字母再加-ed。如:stop-stopped
现在完成时 Present perfect 句型

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。

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).”)
: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) seen the film.
现在完成时的否定形式:
have not (haven’t) +过去分词
has not (hasn’t) +过去分词
I haven’t eaten supper. eat-eaten
He hasn’t changed his idea. change-changed
My mother hasn’e back home. e
否定句
I’ve already had dinner.
I ________ ________ dinner ________.
2. He has just finished his homework.
He ________ ________ his homework _________.
3. Mum’s cooked the dinner.
Mum _______ ________ the dinner.
4. Susan’s learned English at school.
Susan ________ ________ English at school.
haven’t
had
yet
hasn’t
finished
yet
hasn’t cooked
hasn’t
learned
把下列句子改为否定句
Have you eaten your breakfast?
现在完成时的一般疑问句形式
Have/has 提前+过去分词
Have you known Sandy for a long time?
Yes, I have/ No, I haven’t. know-known
Has she eaten anything since 9:00 .
Yes, she has/ No, she hasn’t. eat-eaten
疑问句