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三年级上册《Review 1：Review of Units1-4》优秀ppt课件
sing
singing
Look at the boy.
ing
She’s writing.
writ
e
( She’s = She is )
study
studying
They are studying.
What are you doing, Miss Lee?
I am studying.
What are you doing?
I am ….
swim
m
I’m swimming.
What are you doing, little boy?
ing
fish
ing
I’m fishing.
What are you doing, Mr. Black?
I’m reading.