现在完成时以及for,since的用法

for +一段时间表示时间的持续 强调一段时间 have / has been + doing sth + since +过去的时间点 表示“自从过去某一时间 点以来” 强调动作或状态一直延续到现在 since + 从句 (一般过去时) 表示从过去开始一直持续到现在的动作，并有可能持续下去．
与过去时的比较：
1.I watched TV for three hours.我看了三小时的电视．（我现在没有看电视了）
2.I have been watching TV for three hours. 
我看了三小时的电视．（我现在仍然在看电视）
一．用for 或者since 填空。

填空。

1.They have been learning Chinese since they came to China. 
2. I haven’t seen her ___for __ a long me. 
3. He has been living here _since____ 2001. 
4. She has been doing her homework __for__two hours. 
5. It’s 5 years __since___ we le school. 
6. – How long has Mary been a teacher? 
– __since___ two years ago. 
7.I have been prac cing the piano _since ___ 10:30. 
8.Maricia has been running __for__ 15 minutes. 
9.Sarah has been sleeping ___since__ 9:00. 
10.Dale has been talking on the phone __for___5 minutes. 
11.Louie has been studying Chinese __since__ he was 6 years old.. 
12.I have been watching you __for__10 minutes. 
二．单项选择题。

二．单项选择题。

1. 1. —— I’m I’m sure sure sure Andrew Andrew Andrew will will will win win win the the the first first first prize prize prize in in in the the the final. final. — I I think think think so. so. so. He He ________ for it for months. 
A. is preparing 
B. was preparing 
C. had been preparing 
D. has been preparing 2. By the me he realizes he _________ _________ int int into o a trap, i t’ll it’ll be too too late for late for him to d o do anything about it. 
A. walks 
B. walked 
C. has walked 
D. had walked 
3. So far this year we _______ a fall in house prices by between 5 and 10 percent. 
A. saw 
B. see 
C. had seen 
D. have seen 
4. Cathy is taking notes of the gramma cal rules in class at Sunshine School, where she ______ English for a year. 
A. studies 
B. studied 
C. is studying 
D. has been studying 
5. Danny _________ hard for long to realize his dream and now he is popular. 
A. works 
B. is working 
C. has worked 
D. had worked 
6. —I have got a headache. 
—No wonder. You_________ in front of that computer too long. 
A. work 
B. are working 
C. have been working 
D. worked 
7. 7. The The The unemployment unemployment unemployment rate rate rate in in in this this district_______ district_______ from from from 6% 6% 6% to to to 5% 5% 5% in in in the the the past past past two two years. 
A. has fallen 
B. had fallen 
C. is falling 
D. was falling 
8. Now that she is out of job, Lucy ___ going back to school ，but she hasn’t decided yet. 
A. had considered 
B. has been considering 
C. considered 
D. is going to consider 
9. —______ you ______ him around the museum yet? 
—Yes. We had a great me there. 
A. Have ; shown 
B. Do ; show 
C. Had; shown 
D. Did; show 
10. —Hi, Tracy ，you look pale. 
—I am red. I _______ the living room all day. A. painted B. had painted C. have been pain ng D. have painted 
1-5 DCDDC 6-10 CABA C 。