為你解答.
1．昨天這個時候你們英語老師在做什么?她在和一些家長談話嗎?
What was your English teacher doing at this time yesterday?
Was she talking with any parents?

2．當我離開的時候他正在畫一幅世界地圖.
When I left, he was drawing a map of the world.

3．當你看見他們的時候他們在干什么?他們在打掃教室.
What were they doing when you saw them? They were cleaning the classroom.

4．那時二班的學生沒在操場上踢足球,他們在打籃球.
The students of Class Two weren't playing football on the playground at that time.
They were playing basketball.

5．一天,母親下班回家的時候,約翰在寫給一個朋友寫信.
One day, when mum returned home from work, John was writing a letter to his friend.

6．上周五一下午,學生們在干什么?他們一直在往墻上貼海報.
What were the students doing last Friday afternoon?
They were putting on some posters on the wall.

7．昨天這個時候,一些學生在植樹,一些學生在給小樹澆水.
At this time yesterday, some students were planting trees, and some are watering the young trees.

8．老師走進教室的時候,學生們正在談論當天的新聞.
When the teacher entered the classroom, the students were talking about the news of the day.

9．老虎等猴子的時候,他聽到一個聲音.
While the tiger was waiting for the monkey, he heard a sound.

10.今天上午放學的時候在下雨嗎?是的,天正下著大雨.
Was it raining when school was over this morning? Yes, it was raing heavily.