动词加ing的用法是什么（动词什么时候加ing）
He is reading a book now.
他正在看书.
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？
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(现在分词)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(现在分词)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(动名词)Swimming is very popular in summer.
His job is teaching English.
综上所述，动词在以上六种情况需要加ing！
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