什么时候动词后面加ing？

一、动词加ing做谓语情况

做谓语时动词加ing前面必须加上be动词,形成be+动词ing(现在分词)作句子谓语，构成进行时态句子。

He was watching TV when his mother came in.

他妈妈进来时，他正在看电视。

They've been waiting for you for three hours.

他们等你三个小时了.

二、动词加ing做非谓语情况

1、动词作介词的宾语要加ing(动名词)

I'm looking forward to seeing you again.

我期盼着再次见到你.

The boy is so excited about hearing from his mother.

男孩为收到他妈妈的来信很兴奋。

2、部分动词用动词做宾语。做宾语的动词要加ing(动名词)

I Practising speaking English Every day.

我每天练习说英语.

Could you mind opening the door?

你介意开门吗？

3、一些固定句式后面要加动词ing(现在分词)

We have fun Playing in the park on Sunday.

星期日我们在公园玩得很开心。

Most students have problems speaking English.

许多学生在英语口语方面存在问题。

4、动词修饰名词做后置定语时，要加ing(现在分成)

I heard someone singing in the next room.

我听见隔壁房间有人唱歌。

5、动词做主语和表语时，动词要加ing(动名词)

Swimming is very popular in summer.

游泳在夏天很受欢迎。

扩展资料

一、动词-ing形式的完成式

动词的-ing形式的完成式表示一个已完成的动作，这个动作发生或完成在谓语动词表示的动作之前。

Having lived in this city for three years, she knows it very well.

在这个城市生活了3年，她对这里已很熟悉。

在现代英语中，作宾语的-ing形式的完成式可用一般式来代替。

I really regretted missing such an exciting lecture.

(=I really regretted having missed such an exciting lecture.)

错过了这么振奋人心的演讲，我真的很遗憾。

二、动词-ing形式的被动形式

动词的-ing形式的被动形式表示它的逻辑主语是-ing形式表示的动作的承受者。

1、一般式的被动形式

The question being discussed is very important.  

正在讨论的问题很重要。

2、完成式的被动形式

I heard of his having been chosen to be the coach of the team.

我听说他被选为球队的教练。

你这问题太大了，说说主要的吧。1.有些动词后面接动词ing做宾语，是固定用法，要背，例如，enjoy ,finish,imagine等等好多，要认真记，他们后面一般接动词ing.2.介词后面的动词一般也是用ing,例如，I am good at playing football.介词at后面是ing.这一点好记。3.再就是动词ing做主语，表语，状语，定语等等成分。例如，Teaching is my job. My job is teaching.这一点太多了，不展开了，看看高中语法书吧！
楼上说的进行时也是一种情况，我就不重复了。

一、动词加ing做谓语情况
做谓语时动词加ing前面必须加上be动词,形成be+动词ing(现在分词)作句子谓语，构成进行时态句子。
He was watching TV when his mother came in.
他妈妈进来时，他正在看电视。
They've been waiting for you for three hours.
他们等你三个小时了.
二、动词加ing做非谓语情况
1、动词作介词的宾语要加ing(动名词)
I'm looking forward to seeing you again.
我期盼着再次见到你.
The boy is so excited about hearing from his mother.
男孩为收到他妈妈的来信很兴奋。
2、部分动词用动词做宾语。做宾语的动词要加ing(动名词)
I Practising speaking English Every day.
我每天练习说英语.
Could you mind opening the door?
你介意开门吗？
3、一些固定句式后面要加动词ing(现在分词)
We have fun Playing in the park on Sunday.
星期日我们在公园玩得很开心。
Most students have problems speaking English.
许多学生在英语口语方面存在问题。
4、动词修饰名词做后置定语时，要加ing(现在分成)
I heard someone singing in the next room.
我听见隔壁房间有人唱歌。
5、动词做主语和表语时，动词要加ing(动名词)
Swimming is very popular in summer.
游泳在夏天很受欢迎。

有be动词，表示现在进行时，动词加ing。