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關閉窗口 現在完成時的四種用法
現在完成時是英語中一個很重要的時態，也是很容易弄錯的一個時態。歸納起來，現在完成時共有四種主要用法，現分別解說如下：
一、現在完成時表示影響
該用法的現在完成時表示一個過去發生的動作在過去已經完成，并且這個過去發生并完成的動作對現在有影響或結果，同時說話者強調的或感興趣的就是這個影響或結果，如漢語說“他已離開這個城市了”，其中的“離開”肯定發生了，它對現在的影響或結果就是“他現在已不在這個城市了”；又如漢語說“有人把窗戶打破了”，顯然“打破窗戶”這一動作發生在過去，并且在過去已經完成了，但說話人強調的重點是打破窗戶對現在的影響——窗戶現在仍是破的。如：
He has left the city. 他已離開這個城市。(結果：他不在這個城市。)
Someone has broken the window. 有人把窗戶打破了。(結果：窗戶仍破著。)
I have lost my pen. 我把鋼筆丟了。(結果：我現在無鋼筆用。)
He has finished his work. 他把工作做完了。（結果：他現在可以做其他的事了。）
二、現在完成時表示持續
該用法的現在完成時表示一個過去發生的動作或開始的狀語在過去并未完成或結束，而是一直持續到現在，并且有可能繼續下去(也可能到此結束)，如漢語說“他在我們學校教書已有30年了”，顯然“他在我們學校教書”是從30年前開始，并且一直教到現在，已經持續了30年；又如漢語說“自上個星期以來他一直很忙”，顯然“忙”是從上個星期開始的，并且這一“忙”就一直忙到現在。如：
He has taught in our school for 30 years. 他在我們學校教書已有30年了。
He has been busy since last week. 自上個星期以來他一直很忙。
He has worked for us ever since he left school. 他離開學校以后就一直為我們工作。
三、現在完成時表示重復
即表示從過去某個時間直到現在的這個時間范圍內不斷重復發生的動作或情況，并且這個不斷重復的動作有可能繼續下去，也有可能到現在就結束。如：
How often have you seen her? 你隔多少見她一次?
My father has always gone to work by bike. 我父親一向騎車上班。
四、現在完成時表示將來
同一般現在時可以表示將來一樣，現在完成時也可以在時間狀語從句里表示將來。如：
I’ll wait until he has written his letter. 我愿等到他把信寫完。
When you have rested, I’ll show you the garden. 等你休息好之后，我領你看我們的花園。
【跟蹤訓練】
1. We _______ to move but are still considering where to go to.
A. are deciding B. decided C. have decided D. had decided
2. I left my pen on the desk and now it’s gone; who _______ it?
A. took B. has taken C. will take D. had taken
3. I feel sure I _______ her somewhere before.
A. was to meet B. have met C. had met D. would meet
4. —Will you go to the park now?
—Not until I _______ my physics exercises.
A. will finish B. have finished C. will have finished D. had finished
5. —Did you enjoy the film?
—Yes, it’s the best one I _______ these years.
A. had B. have had C. had had D. would have
6. —Why do you look worried?
—Fred left the company half an hour ago. His work _______ unfinished since.
A. left B. was left C. has left D. has been left
7. —Why did you come by bus?
—My car broke down yesterday evening and I _______ it repaired.
A. didn’t have B. don’ t have C. won’t have D. haven’t had
8. There _______ less accidents on this road since the speed limit was introduced.
A. have been B. were C. had been D. have had
9. Look at that little boy wandering about—perhaps he _______ his mother.
A. will lose B. is losing C. had lost D. has lost
10. The plans _______ under discussion for a year now, but no decision _______ reached.
A. have been, has been B. are, is
C. have been, is D. are, has been
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