高中英語語法分類歸納、練習與分析（精華版）
來源：網絡資源 2009-08-18 10:08:07
高考英語語法分類歸納、練習與分析（精華版）
一．Tenses and voices
A. 現在完成時: 1)表示過去某時發生的行為對主語目前產生的影響。即用過去發生的某個行為來說明現在的某種情況。往往含有"已經……", "已經……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) 到目前為止已發生的。與so far, up till now, in the past/ last …….days/ years, today, this month/ year 等 "包括現在在內的時間狀語"連用。
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）表示過去開始的動作或狀態延續到現在。與for…/ since 連用。
He has worked in the south for ten years/ since ten years ago.
Compare(1):完成進行時表示過去開始的動作一直在進行，直至現在。
He has been working on this project since last month.
(2) 過去時態:指發生在過去某段時間內的事。
He once worked in the south for ten years (現在不在南方)
(3) 過去完成時態:指發生在過去某個時間以前的動作或狀態。常與by/ by the end of..(到了……的時候"連用。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?
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