Mum was doing some cooking, while I was doing my homework.
当我在写作业时，妈妈正在做饭。
When mum finished cooking, I was busy with my study.
当妈妈把饭煮好，我正忙于功课。
When I arrived home, my mum was busy cooking.
当我到家的时候，我妈妈正忙着做饭。
While Mum was cooking dinner, I was doing my homework.
妈妈做饭的时候，我在做作业。
While Mum was cooking dinner, I was doing my homework.
妈妈做饭的时候，我在做作业。
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