1动词加ing做谓语状况
做谓语时动词加ing前面需要加上be动词,形成be+动词ing作句子谓语，构成进行时态句子。
比如:
He is reading a book now.他正在看书.
He was watching TV when his mother came in.他母亲进去时，他正在看电视。
Theyve been waiting for you for three hours.他们等你三个小时了.
1动词加ing做非谓语状况
1、动词作介词的宾语要加ing
Im looking forward to seeing you again.我期盼着第三见到你.
The boy is so excited about hearing from his mother.男生为收到他母亲的来信非常开心。
2、部分动词用动词做宾语。做宾语的动词要加ing
I Practising speaking English Every day.我天天训练说英语.
Could you mind opening the door?你在意开门吗？
I have finished reading three books.我已经看完三本书.
The old man Enjoys living in the country.这老人喜欢住在农村.
3、一些固定句式后面要加动词ing
We have fun Playing in the park on Sunday.
Most students have problems speaking English.
4、动词修饰名词做后置定语时，要加ing
There is a boy Crying over there.
I felt something moving in the house.
I heard someone singing in the next room.
5、动词做主语和表语时，动词要加ing
Swimming is very popular in summer.
His job is teaching English. 综上所述，动词在以上六种状况需要加ing！
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