概念:表示现在在做什么,动作正在进行中;
I am waiting for the train.
My father is living in Xi'an now.
The number of cars on the road is increasing.
概念:表示过去某时正在进行的动作;
What were you doing at seven p.m. yesterday?
Mary was listening to light music 10 minutes ago.
I was washing my hair when you knocked at the door.
概念:强调在将来的某个具体时间正在发生的动作或事情;
Don't call me between 10:00 and 10:30 tomorrow. I'll be having my class then.
Please come tomorrow afternoon, I'll be having a meeting tomorrow morning.
You won't miss her. She will be wearing a white T-shirt and a black skirt at that time.
概念:表示就过去某一时间而言,将来某一时刻或某一段时间正在进行的动作;
I never realized that some day I would be living in China.
He asked me what I would be doing at six o'clock tomorrow.
He said that he could not come because he would be having a meeting.
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