北京KET语法点09期:现在完成体Present perfect
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完成体是动词的一种形式,
它表示该动词所表示的动作或状态已经完成。
现在完成体由have/has+-ed分词构成
⑴现在完成体的肯定形式和否定形式
⑵现在完成体的疑问形式和回答形式
⑶ 动词的分词形式
①The past participle form of regular verbs is the same as the past simple:
walk-walked,smile-smiled
②You will need to learn the past participle form of irregular verbs.Here are some common examples.
总结:大多数动词的过去时和-ed分词都是在原形之后加词尾 -ed 构成(如 study/studied/studied,stop/stopped/stopped),这类动词叫做规则动词。有一些动词不以加词尾-ed 的方式构成过去时和 -ed分词(如 cut/cut/cut, build/built/built, begin/began/begun),这类动词叫做不规则动词。
第一类不规则动词是它们的三个主要形式(即原形、过去时、-ed分词)同形:
hit/hit/hit
set/set/set
put/put/put
第二类不规则动的特点是它们的过去时与 -ed分词同形:
deal/dealt/dealt
flee/fled/fled
第三类不规则动词的特点是它们的三个主要形式都不相同:
ring/rang/rung
steal/stole/stolen
arise/arose/arisen
⑷ 现在完成体的用法
①We can use the present perfect to talk about our experiences:
例句:I’ve seen all the Harry Porter films,but I haven't read the books.
②We do not using say when something happened with the present perfect:
例句:I‘ve been to India.(not I've been to India last year.)
③Use the past simple to say when something happened:
例句:I went to India last year.
④ We often use ever in present perfect questions(ever=in your life):
例句:Have you ever been to India?
Have you ever met someone famous?
⑤We can use never to talk about things we have not done in our life:
例句:She's never been to India.
He's never met anyone famous.
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