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北师大版选修9高三英语课件unit25 going global-grammar extension
General use (1)
To describe an activity which is/was/will be going on
at a certain moment(时刻) of present, past or future.
I am reading a book
now.
I was reading a book
at 5 o’clock yesterday afternoon.
I was reading a magazine
when he came in.
I will be waiting for you
at 5 o’clock tomorrow afternoon.
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