今天我们一起学习英语基础语法中12个时态里的过去进行时。

过去进行时在英语中是一个重要的时态。我们用它去表述我们在过去的特定时刻中正在做什么。

The Past Continuous tense is an important tense in English. We use it to say what we were in the middle of doing at a particular moment in the past.

过去进行时的结构如下：

助动词be有两种形式：was，were

主动词使用现在分词形式-ing

对于否定句我们只需把not插入助动词和主动词之间即可

对于疑问句，我们只需把主语和助动词对调

The auxiliary verb (be) is conjugated in the Past Simple: was, were

The main verb is invariable in present participle form: -ing

For negative sentences we insert not between the auxiliary verb and the main verb.

For question sentences, we exchange the subject and the auxiliary verb.

来看看以下的过去进行时的栗子：

我们如何使用过去进行时？

过去进行时表达在过去特定时刻的行为。这个行为在那个时刻之前发生但在那个时刻还没完成。

举个栗子：

Yesterday I watched a film on TV.

The film started at 7pm and finished at 9pm.

我们用过去进行时态的时候，我们的听者通常知道或了解我们在讲的是什么时间点。

看下面的栗子：

I was working at 10pm last night.

They were not playing football at 9am this morning.

What were you doing at 10pm last night?

What were you doing when he arrived?

She was cooking when I telephoned her.

We were having dinner when it started to rain.

Ram went home early because it was snowing.

我们经常用过去进行时在故事里交代背景。我们用它描述在行动发生时刻的背景。经常的，故事用过去进行时开始，随后转移到一般过去时。

We often use the Past Continuous tense to "set the scene" in stories.

We use it to describe the background situation at the moment when the action begins.

Often, the story starts with the Past Continuous tense and then moves into the Past Simple tense.

这里有个栗子：

"James Bond was driving through town. It was raining. The wind was blowing hard. Nobody was walking in the streets. Suddenly, Bond saw the killer in a telephone box..."

过去进行时+一般过去时（Past Continuous + Past Simple）

过去进行时和一般过去时可以同时使用 ，通常用过去进行时表达长时间做的动作，在中间穿插这个时间段所做的短时动作。

We often use the Past Continuous tense with the Past Simple tense. We use the Past Continuous to express a long action. And we use the Past Simple to express a short action that happens in the middle of the long action. We can join the two ideas with when or while.

在接下来的例子中，我们会有两种动作：

长时动作long action：(watching TV), expressed with Past Continuous

短时动作short action： (telephoned), expressed with Past Simple

可以用when把这两种时态联系成一句话

I was watching TV when you telephoned.

注意栗子中的"when you telephoned" ，同样也是一个明确的时间点（下午8点）

Notice that "when you telephoned" is also a way of defining the time (8pm).

我们使用：

when与一般过去时连接-短时间的动作 when + short action (Past Simple)

while与过去进行时连接-长时间行为 while + long action (Past Continuous)

以下是四种基本连接方式：

注意长动作和短动作是相对的（Notice that the long action and short action are relative.)

看电视花费了两小时，打电话只持续了几秒钟；从汽车旁经过花费了几秒钟，爆炸却是在一瞬间（毫秒）就发生的事

"Watching TV" took two hours. "Telephoned" took a few seconds.

"Walking past the car" took a few seconds. "Exploded" took milliseconds.

总结

过去进行时可以描述过去事情所发生的时间在讲述一个故事的背景时用过去进行时，在叙述时用一般过去时when 一般过去时（短动作）while 过去进行时（长动作）这里动作的长短是相对而言

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