过去进行时
1） 概念：表示过去某时正在进行的状态或动作.
2） 过去进行时的主要用法是描述一件事发生的背景；一个长动作发生的时候,另一个短动作发生.
3) 常用的时间状语
this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while
My brother fell while he was riding his bicycle and hurt himself.
It was raining when they left the station.
When I got to the top of the mountain, the sun was shining.
典型例题
1) Mary ___ a dress when she cut her finger.
A. made B. is making C. was making D. makes
答案C. 割伤手指是已发生的事情,应用过去时.同 时,when表时间的同时性,"玛丽在做衣服时"提供事情发生的背景,因此用过去进行时.
2) As she ___ the newspaper, Granny ___ asleep.
read； was falling B. was reading； fell C. was reading； was falling D. read；fell
答案B.句中的as = when, while,意为"当……之时".描述一件事发生的背景时,用过去进行；一个长动作发生的时候,另一个短动作发生.句意为 "在她看报纸时,奶奶睡着了."句中的 fell (fall的过去时),是系动词,后跟形容词,如：fall sick.
现在完成时(The Present Perfect Tense)
1. 动作发生于一个非确定的过去的时间(过去的时间并不重要或根本不知道),但它的结果仍对现在有影响.
I have read the letter, and I know what it is about.
2. 动作发生在过去,目前仍在继续或刚刚结束, 常和 "for" 加上 "一段时间", 或"since" 加上"一个确切的过去的时间" 连用.
a) "for" 用于过去的一段时间. (动词必须是可以延续的)
He has been there for six months. 她去那儿有6个月了.
(直到现在)
He went there 6 months ago.
He has never been there. 他从来都没去过那里.(直到现在)
b) "since" 用于过去的一个确切的时间, 意思是"从那时一直到现在", 总是和完成
时一齐用, 而且不能省略. (主句动词必须是可以延续的)
Tim has been in Nantong since January. 自从1月份以来他一直都在南通.(现在仍在南通)
注意: "since" 后面的确切的过去的时间也可以是一个含有过去时的从句.
He has been interested in collecting coins since he was a child.
他打小时侯起就对收集硬币感兴趣.（现在还是如此）
c) 现在完成时常和短语 "up to now /till now", "so far" (意思是从过去某一确定的时间一直延续到现在.)
Up to/till now he's read many story books. 至今他已读过好多故事书.
I've been to New York three times so far. 至今我已到纽约去过三次.
3. 刚刚完成的动作.
I've just got a letter from my brother.
4. "already" 用于现在完成时的肯定句中, "yet" 用于现在完成时的否定句和疑问句中
He has (already) visited many places in China. (already)
He has come back now. Have you ever been to Australia?
注意 "already" 在句中的两种位置.
The train hasn't arrived yet.火车（到现在）还没有到.
Has she arrived yet? 她已经到了吗?Hasn't he come yet? 她还没来吗?
I haven't been very successful so far.我一直都没有成功.
注意: "have been"（去过） 和 "have gone"（去了） 的区别:
He has gone to Beijing . (He is there or is on his way there.)
He has been to Shanghai . (He was there once, but he is not there now.)
5. 当现在完成时句中无时间状语, 它只是指一个简单的已经完成的动作
I've cleaned the sitting-room. 我已把起居室打扫过了.(已完成了工作)
6. 现在完成时可以用来表示一个反复发生的动作.
He has rung me up five times today. (五次分隔的行为)
8. 一般过去时(常带有确切的表示过去的时间状语)和现在完成时的比较:
When did you stay at this hotel?
I stayed here five years ago.
Have you ever stayed at this hotel?
Yes, I've stayed here twice. (无确切的过去的时间状语)
Yes, I stayed here for two months. (过去的一段时间, 我已不在那儿.)
Yes, I stayed here five years ago. (有确切的过去的时间状语)
How long have you been staying at this hotel?仍在这儿)
9. 通常和现在完成时一起用的副词:
I have just got a letter from my brother.
He has already bought an American car and has gone to the U.S.A.
He has been there for six months so far.
Mother has never been abroad before.
常和完成时连用的副词和实践短语：
already, yet, just, ever, never, before
today, now, this morning, this week, these days, in the past two years
for three hours, for two weeks, for years, for a long time
since three o'clock, since last Tuesday, since 1980, since then
since he came here, since we began to learn English
II. Put the following into Chinese and tell out the difference between them:
1. I have seen the film. I saw it last night.
2. The plane has not arrived yet. It will arrive soon.
3. Where have you been? I have been to the library.
What did you do there? I returned some books.
4. Where is Xiao Li? He has gone to the playground.
5. What are you doing now? I am reading a book on radio.