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过去进行时用来表示在过去某个时刻正在进行的动作，由be动词的过去式（was / were）加动词的现在分词形式构成。
We were waiting for the bus at the airport at 7.30 this morning .
今天早晨七点半的时候，我们正在机场等大巴车。
When I was talking to Nancy, the boss came in.
我正跟南希说话的时候，老板进来了。
I was having an interview online when the network broke down.
我正在进行线上面试，突然网断了。
一般现在时的结构
请将下面每个句子中的错误改正，每题只有一处错误。
1. Sue talked with her mother when I arrived.
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2. I saw my maths teacher while I am waiting for Joe.
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3. What are you doing at 8.30 this morning?
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4. When Peter knocked at the door, Monica and I cooked a meal.
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5. She didn’t sleeping at that moment.
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