2．功能：

（1）表示從過(guò)去某時(shí)開(kāi)始發(fā)生，一直延續(xù)到現(xiàn)在且可能延續(xù)下去的動(dòng)作。 （將此定義讀 5遍）
►. I've been waiting for an hour but she hasn't come.
►. He has been running after her for 8 years.

（2）表某種感情色彩。
►. I've been wanting to see you for so many years.
►. Who's been telling you such nonsense.

現(xiàn)在完成時(shí)與現(xiàn)在完成進(jìn)行時(shí)的對(duì)比：
現(xiàn)在完成時(shí)強(qiáng)調(diào)“結(jié)果”，而完成進(jìn)行時(shí)強(qiáng)調(diào)“動(dòng)作的延續(xù)”。
►. I have thought of it.（我已想到了這一點(diǎn)。）
►. I have been thinking of it.（我一直在想這一點(diǎn)。）
►. Jim has painted the door.（杰姆已將門(mén)油漆過(guò)了。）
►. Jim has been painting the door.（杰姆一直在油漆門(mén)。）

測(cè)試精編

1. They ________ us since five o'clock this morning.
A. are helping B. have been helping
C. have been helped D. have helped

2. I ________ the book the whole day, yet I haven't finished it.
A. have been reading B. have read
C. am reading D. had been reading

3. Please come in. We ________ about your paper.
A. talk B. had been talking
C. have been talking D. would have talked

4. Such natural resources as coal and petroleum ________.
A. gradually are exhausted B. are being gradually exhausted
C. have gradually exhausting D. have been exhausting gradually

5. It ________ almost every day so far this month.
A. is raining B. rained C. rains D. has been raining

用所給動(dòng)詞正確時(shí)態(tài)填空：
1. You should go to bed. You ________ (watch) TV for 5 hours.
2. I ________ (write) letters since breakfast.
3. I ________ (write) 3 letters since breakfast.
4. Sorry, but Mr. Smith ________ (leave) for Beijing.
5. I ________ (look) for him everywhere, where can he be?

KEYS

1. B 2. A 3. C 4. B 5. D

用所給動(dòng)詞正確時(shí)態(tài)填空：
1. have been watching 2. have been writing
3. have written 4. has left
5. have been looking