admin 先当作谓词吧。
这时动词要在ing前加上be动词，使be动词ing(现在分词)成为句子谓词，形成时态句子。
例如:
- 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.
现在我们来看动词加ing做非谓语的情况：
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(现在分成)！
- 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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