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1) 一般情况下，在动词原形后直接加-ing。如：
work—working do—doing play—playing
2) 以不发音的字母e结尾的动词，去掉e，再加-ing. 如：
dance—dancing come—coming
3) 重读闭音节单词，如果末尾只有一个辅音字母，则双写这一字母，再加-ing。如：
get—getting shop—shopping
run—running swim—swimming
Do you know how to get “ -ing” ? Let’s try !
watching
doing
cleaning
playing
writing
reading
running
swimming
eating
dancing
Let’s read these sentences.
What are you doing?
I’m watching TV.
What’s she doing?
She’s washing her clothes.
What are they doing?
They’re listening to a CD.
Are you doing your homework?
Yes, I am. / No, I’m not. I’m cleaning my room.
Is he reading a newspaper?
Yes, he is. / No, he isn’t. he’s playing basketball.
Are they using the computer?