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He was reading in the library when the rainstorm came.
4. What was Ben doing when it began to rain heavily?
When it began to rain, Ben was helping his mom make dinner.
5. What was Jenny doing while Linda was sleeping?
While Linda was sleeping, Jenny was helping Mary with her homework.
Step 3 过去进行时
1. 基本概念：过去进行时表示在过去某一时刻或一段时间内正在进行的动作。这一特定的过去时间除有上下文暗示以外, 一般用时间状语来表示。
2. 结构 was / were ( not ) + 动词-ing
3. 句式
肯定式：
I/He/She/It was working.
We/You/They/ were working.
否定式:
I/He/She/It was not working.
We/You/They/ were not working.
疑问式和简略回答:
Was I working?
Yes, you were.
No, you were not.
Were you working?
Yes, I was.
No, I was not.
Was he/she/it working?
Yes, he/she/it was.
No, he/she/it was not.
Were we/you/they working?
Yes, you/we/they were.
No, you/we/they were not.
注：
1) was not常缩略为wasn’t; were not常缩略为weren’t。