一、定义：现在进行时表示现在或当前一般时间正在进行的动作。可以表示有计划的未来。 现在分词变化规则
结构：is/am/are+现在分词
二、现在进行时用法
1、表示现在正在进行的动作或发生的事。
例句：

Is the sun shining?

出太阳了吗？

It is snowing outside.

外面在下雪。

The bus is coming.

公交车开过来了。

2、表示现阶段正在进行的动作或发生的事。
例句：
She is learning English at college.

她目前在大学里学英语。

John is losing his hair.

约翰最近脱发了。

3、表示某个按最近的计划或安排将要进行的动作，或即将开始/结束的动作。常用的词有：go,leave,come,arrive,land,meet,move,return,start,stay,stop,do,dine,give,have,pay,join,punish,spend,sleep,take,change,fly,work,wear,see,lunch,play等。
例句：
He is meeting the manager tomorrow.

他明天要跟经理见面。

I’m changing my hotel.

我打算换旅馆。

The man was drowning.

那人快要淹死了。

4、动作动词的进行时与always,forever,continually,constantly等连用，表示重复的动作，这种动作可能使人感到不满、厌倦或觉得不合情理，有时表示赞赏、满意。
例句：
Tom is always coming late for class.

汤姆上课总是迟到。

He’s constantly changing his mind.

他老是改变主意。

The man is always boasting.

那人老爱吹牛。

The students are making progress constantly
.
学生们在不断进步。

用所给的动词的正确形式填空：

 1．He ________________ (listen) to music now.

2．My parents __________ (be) at home now, but they __________ (be) in the park just now.

3．I ____________( not like) cats, but my mother _____________ (like) cats.

4．Public signs ____________ (mean) different things.

5．Would you like _______________(go) shopping with me?

6．Where _________ (be) you yesterday morning? I ________ (be) ill in the bed.

7．They _________________(not play) football now. 8．___________ Miss Li ____________(come) from Nanjing? No, she ________(be) from Shanghai.

9．There is an ________ (excite) running race this afternoon. All the students are very ______ (excite).

10. What ______ you usually _______ (do) on Sundays? I usually ___________ (do) my homework.