九乡新闻网鳄鱼来了儿歌视频:高考英语语法分类归纳、练习与分析（精华版）
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高考英语语法分类归纳、练习与分析（精华版）
一．Tenses and voices
A. 现在完成时: 1)表示过去某时发生的行为对主语目前产生的影响。即用过去发生的某个行为来说明现在的某种情况。往往含有"已经……", "已经……了"的意思。
Eg.Don't think any more about it. I have decided not to help you.
I have experienced that before, so I know how to deal with it.
2) 到目前为止已发生的。与so far, up till now, in the past/ last …….days/ years, today, this month/ year 等 "包括现在在内的时间状语"连用。
My brother is an actor. He has appeared in several films so far.
Great changes have taken place in this area in the recent years.
3）表示过去开始的动作或状态延续到现在。与for…/ since 连用。
He has worked in the south for ten years/ since ten years ago.
Compare(1):完成进行时表示过去开始的动作一直在进行，直至现在。
He has been working on this project since last month.
(2) 过去时态:指发生在过去某段时间内的事。
He once worked in the south for ten years (现在不在南方)
(3) 过去完成时态:指发生在过去某个时间以前的动作或状态。常与by/ by the end of..(到了……的时候"连用。例如：
1）By the time we got to the theatre, they had sold all the tickets.
2）How many words had you leaned by the end of last year?