现在完成进行时和固定句式或结构中的动词时态
现在完成进行时 （主语﹢have/has been ﹢动词 –ing）
① 表示从过去某时开始一直持续到现在的动作，并且可能继续持续下去。
The Chinese have been making paper for two thousands years.
中国有2000年的造纸历史。（动作还将继续下去）
① 表示在说话时刻之前到现在正在进行的动作。
We have been waiting for you for half an hour.
我们应经等你半个钟头了（人还没到，如同在电话里说的，还会继续等下去）.
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将来进行时：shall/will + be + 现在分词"，表示将来某一时刻正在进行的动作。
What will you be doing (at eight) next week?
I won’t be free Friday morning. I’ll be seeing a friend off.
固定句式或结构中的动词时态
1.This/It is the first/second time＋that从句。that从句中用现在完成时。
如把is改为was，则从句中用过去完成时。
This is the first time I have come here.
It was the third time(that)he had made the same mistake.
2．It is/has been＋一段时间＋since 从句。since从句中用一般过去时。
如 把is改为was，则从句中用过去完成时。
It is/has been three years since we have had such a wonderful time.
It was ten years since we had had such a wonderful time.
3．was/were about to do...when... 意为“将要做……(这时)突然……”。
I was about to go out when the telephone rang.
【典例精析】
1. At present, one of the apartments in favor of the new airport ________ that it will going a lot jobs to the area.
A. is B. are C. will be D. were
【解析】本题考查时态的用法。A。根据at present =now 可知，应用一般现在时。
2. The number of foreign students attending Chinese universities ________ rising steadily since1990.
A. is B. are C. has been D. have been
【解析】本题考查主谓一致和时态，主语是 the number故谓语动词用单数，又因时间状语是since 1997所以用完成时态C。
3. I was out of town at the time, so I don’t know exactly how it _______.
A. was happening B. happened C. happens D. has happened
【解析】本题考查具体语境中的时态，后一句隐藏的时间状语是at the time. B
