1、本网站免费注册后即可以下载,点击开通VIP会员可无限免费下载!
2、资料一般为word或PPT文档。建议使用IE9以上浏览器或360、谷歌、火狐浏览器浏览本站。
3、有任何下载问题,请联系微信客服。
扫描下方二维码,添加微信客服
(一)、概念:
1. 表示过去或已经完成的某一动作对现在 成的影响或结果。常与下列状语连用:already, just, yet, ever, never, before
I have just had my breakfast.(现在我不饿)
2. 表示过去已经发生,持续到现在的动作或状态,可以和表示从过去某一时刻延续到现在(包括“现在”在内)的 一段时间的状语连用。I have lived here since three years ago.
a. for和表示一段时间的词组连用。
如:I have lived here for three years.
b. since和表示过去某一时刻的词或词组连用。如:since 1997, since two years ago, since last week
I have lived here since three years ago.
(二)、构成: have / has + v 过去分词
肯定句:I have finished my homework.
否定句:I haven't finished my homework.
一般疑问句:Have you finished your homework? Yes, I have. / No, I haven’t.
(三)相关知识
1、already
“已经”通常用于肯定句中。 I have already posted the letter.
有时,也用在疑问句中表示惊讶。 Have you eaten up all the food already?
2、yet
“仍然,还 ” 用在疑问句和否定句中。
I haven’t read this book yet . Have you had breakfast yet ?
3、ever“曾经”通常用于疑问句和肯定句中。
I have ever seen this film. Have you ever been to the USA ?
4、never“从来不” 用在否定句中。
Is he famous? I have never heard of him.
5、just“刚刚 ”用在陈述句中。
I have just bought a novel.
6、before“以前”用在完成时中,放在句尾。
Ihave never read this kind of books before.
7、动词的过去分词
a.规则动词finish--finished--finished live--lived--lived
carry--carried--carried stop—stopped--stopped