3. Hello, I ____ you were in London. How long _________ here?

　 A. don’t know; were you　　　　　 B. hadn’t known; are you

　 C. haven’t known; are　　　　　　 D. didn’t know; have you been

2. We haven’t heard from Jane for a long time. What do you suppose _______ to her?

　 A. was happening　　 B. happens　　　 C. has happened　　 D. happened

1. --- Where __you __ (put) the book?　 I can’t see it anywhere.

　 --- I ___(put) it right here. But now it’s gone.

　 A. did ; put; put　 B. have; put; put　 C. did; put; have put　 D. have; put; have put

10. Thank you. I’ve had my supper.

　 以上各句用的都是现在完成时，可以看出，与一般过去时一样，现在完成时所表示的动作也是发生在过去(说话以前)，但它强调的是：

　 1)动作从过去持续到说话这一时刻(例5---7)

　 2)过去的动作对现状有某种影响(例8---10)，说话人强调的是现在如何。

注意在现在完成时的第一种用法中，时间状语常用for…; since…短语(从句)

　如：We haven’t seen each other for many years./ since he left 10 years ago.

　此时(主句)谓语动词不能用非延续性动词。如：

　 * He has left home for many years.(错误)

　 * He has been away from home for many years. (正确)

　 * He has died since 1990.　 (错误)

　 * He has been dead since 1990.(正确)

两种时态的比较练习:

9. The city has taken on a new look.

8. The students have already left.

7. I’ve always walked to work.

6. I haven’t seen him for many days.

5. How many pages have you covered today?

4. I didn’t know you were so busy. (我没想到你这么忙。)

　 以上各句中用的都是一般过去时，显然，说话的人是强调过去某时发生的动作或情况。