1. 动词变化：现在进行时由“am /is /are＋动词现在分词”构成。加-ing的规则如下：

(1)一般在动词原形末尾加-ing。如：

stay-staying do-doing

listen-listening suffer-suffering

work-working spend-spending

look-looking

(2)以不发音的字母e结尾的动词，先去掉e，再加-ing。如：

make-making take-taking

give-giving ride-riding

please-pleasing refuse-refusing

close-closing operate-operating

(3)以一个辅音字母结尾的重读闭音节词，先双写这个辅音字母，再加-ing。如：

put-putting sit-sitting

run-running win-winning

begin-beginning

2. 现在进行时的用法

(1)表示说话时正在进行或发生的动作，这时可以不用时间状语，也可以和now, at present, at the moment等时间状语连用。有时用一个动词，如look(看)，listen(听)。

eg: What are you reading now?

Listen! Someone is singing in the classroom.

(2)表示当前一段时期的活动或现阶段正在进行的动作。

eg: They are working in a factory these days.

More and more people are giving up smoking.

(3)表示最近按计划或安排要进行的动作。

现在进行时有时可表示一个在最近按计划或安排要进行的动作，即可以用来代替将来时。

eg: When are you leaving?

Are you going to Tibet tomorrow?

3. 现在进行时的否定句和疑问句比较简单。否定句在be(am, is, are)后面加not;疑问句把be动词移到主语前。

eg:

I am not working.

What are you reading now?

How are you feeling today?

The train isn’t arriving soon.

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