They are listening to music now.

5.过去进行时(was/were doing)表示过去某时正在进行的动作，动

作没有完成：

At that time he was working in a laboratory.

注意：与一般过去时的区别：

He was reading a novel last night.(正在读，没读完)

He read a novel last night.(读完了)

6.现在完成时(have/has done)

(1)动作发生在过去，但对现在有影响，与already, just, ever, yet,

before, recently等连用，谓语用瞬间动词：

Who has opened the door? (含义：The door was opened. It is

still open. It's cold.)

(2)动作从过去某时开始，一直持续到现在，与for, since或so

far, these days, in the past five years连用，谓语用延续性动词：

I have been in Beijing for half a month.(不能用have come, 但

可说：He has already come.)

(3)过去动作到现在为的总和。

How many English words have you learned?

(4)have been to a place/have gone to a place

He has been to Beijing twice.(主要强调He has come back.)

He has gone to Beijing.(主要强调He isn't here.)

7.过去完成时(had done)是时态中的又一难点，不是字面意思，

而是表示过去某时或某个动作之前发生的动作，"过去的过

去"，是一个相对的时态,往往与by, when, before等连用，或在

宾语从句中：

By ten o'clock we had done half of the work.

The meeting had already begun when they arrived.

8.现在完成进行时(have/has been doing)表示现在以前一直在

进行 的动作，也可停止一会儿，用延续动词，与现在完成时相

比，更强调"一直在进行"：

We have just been talking about you.

Your mother has been looking for you and she still is.

9.一般过去将来时表示从过去某时看来将要发生的动作，与一般

将来时一样，也有多种表达方式：

He said they would return soon.

She said that there was going to be a film.

We were to meet at about 5.

She said she was leaving soon.