2.LOOK!The bus is coming.因为有look,所以用现在进行时.
3.Bill was waiting for his wife when i saw him.
我看到比尔时他正在等他妻子,因此用过去进行时.
4.Listen!Someone is crying in the next room.
因为有listen,所以用现在进行时.
5.It's Sunday morning.Some children is having a good time in the park.
前面有时间状语,表示现在的事实,因此用现在进行时.
6.mother was watching TV while father was reading the newspaper this time yesterday evening.
昨天的这个时候,母亲在看电视父亲在读报纸,因此用过去进行时.
7.while they were having supper.all the lights went out.
用过去进行时表示在他们吃晚饭时,所有的灯都灭了.