新概念英语第二册课文详解及语法解析,新概念英语第二册语法解析及练习题：现在完成进行时

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　　一.现在完成进行时：have / has + been + 现在分词

　　1.表示从过去某时开始发生，一直延续到现在且可能延续下去的动作。(将此定义读 5遍)

　　I've been waiting for an hour but she hasn't come.

　　He has been running after her for 8 years.(run after: 追求)

　　2.表某种感情色彩。

　　I've been wanting to see you for so many years.

　　Who's been telling you such nonsense.

　　释惑要点：现在完成时与现在完成进行时的对比：

　　现在完成时强调“结果”，而完成进行时强调“动作的延续”。

　　I have thought of it.(我已想到了这一点。)

　　I have been thinking of it.(我一直在想这一点。)

　　Jim has painted the door.(杰姆已将门油漆过了。)

　　Jim has been painting the door.(杰姆一直在油漆门。)

　　练习：

　　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

　　用所给动词正确时态填空。

　　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?

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