本站提供北师大版选修9高三英语课件unit25 going global
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