I am watching TV now.

我正在看电视。

句型：主语+be（am，is，are）+现在分词～.

Look！Nancy is doing her homework

看！南希正在做作业。

They are cleaning their classroom.

他们正在打扫他们的教室。

She isn’t reading now.

过去进行时

He was walking in the park at that time yesterday

昨天那个时候，他正在公园散步。

句型：主语+be（was，were）+现在分词～.

I was watching TV then.

那时，我正在看电视。

When I came home， they were cooking in the kitchen.

当我进家时，他们正在厨房里做饭。

When he knocked at the door， we weren’t doing our homework.

当他敲门时，我们没有在写作业。

Were you cooking at that time？

那时，你在做饭吗？

现在进行时的用法： 其结构是助动词be的过去形式is/are/am +v-ing.

其句式变化仍然要在be上做文章。

现在（说话的瞬间）正在进行或发生的动作，强调“此时此刻”。E.g. He is reading . They are talking now.

2、当前一段时间内的活动或现阶段正在进行的动作。E.g. They are working these days.

3、某些动词的现在进行时，表预定的计划或即将发生的动作。E.g I am coming.

其结构为be+现在分词. 现在分词的变法有

1、一般在动词词尾加上-ing ,E.g. jump

2、以不发音字母e结尾的动词，先去e，再加-ing. E.g have write

3、.以重读闭音节末尾只有一个辅音字母结尾的词，它前面是单个元音字母时要先将词尾的辅音字母双写，再加上-ing. E.g. sit put

其句式变换都在be上做文章。

E.g. He is buying a bike.

Is he buying a bike?

He isn’t buying a bike.

一般由look,listen,now, at this moment等时间状语做标志。

4. 习惯进行：表示长期的或重复性的动作，说话时动作未必正在进行。

Mr. Green is writing another novel.

(说话时并未在写，只处于写作的状态。)

She is learning piano under Mr. Smith.

5. 表示渐变的动词有：get, grow, become, turn, run, go, begin等。

The leaves are turning red.

It’s getting warmer and warmer.

6.与always, constantly, forever 等词连用，表示反复发生的动作或持续存在的状态，往往带有说话人的主观色彩。

You are always changing your mind.

典型例题

My dictionary ___, I have looked for it everywhere but still___ it.

A. has lost, don’t find B. is missing, don’t findC. has lost, haven’t found D. is missing, haven’t found.

答案D. 前句是一个仍在持续的状态，应用进行时，由于没有找到，其影响仍然存在，应用完成时，瞬间动词用于否定式时可用于完成时。