动词什么时候加ing?记住六种情况就可以做宾语 _什么时候

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作谓语时动词加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 is listening to music now.
他正听音乐。
We've been waiting for them for two hours.
我们等他们两个小时了。

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He was doing his homework when his mother came in.
他妈妈进来时，他正在做家庭作业。

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1、动词作介词的宾语要加ing(动名词)
The girl is so excited about hearing from her boyfriend.
这个女孩收到男朋友的来信很兴奋。
I'm looking forward to seeing you again.
我期盼着再次见到你。

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2、部分动词用动词作宾语。作宾语的动词要加ing(动名词)
The student was practising making a new vowel sound.
这个学生正在练习发一个新的元音。
I don't mind doing chores.
我不介意做家务。
Mary enjoys reading very much.
玛丽非常喜欢阅读。

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3、一些固定句式后面要加动词ing(现在分词)
We're going to have fun doing sports after school.
放学以后我们将愉快地进行体育活动。
He is quite used to working hard.
他很习惯努力工作。
Most students have problems speaking English.
大多数学生说英语有困难。
I prefer walking to cycling.
我愿意步行，而不愿意骑自行车。

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4、动词作主语和表语时，动词要加ing(动名词)
Working with you is a pleasure.
和你一起工作是一种乐趣。
Seeing is believing.
眼见为实。
5、动词修饰名词做后置定语时，要加ing(现在分词)
There is a girl crying over there.
那边有个女孩在哭。
【动词什么时候加ing?记住六种情况就可以做宾语】She heard someone singing in the next room.
她听见有人在隔壁的房间里唱歌。