She was doing her homework when I left.
当我离开时，她正在做作业。
She was doing her homework at 8:30 yesterday evening.
昨天傍晚八点半她正在做家庭作业。
Last night she was doing her homework when the light went out.
昨晚她正在做作业，电灯突然熄了。
Wu Qiong, her classmate, was doing his chemistry homework carefully.
她的同学吴琼正在认真地做化学作业。
While her children were doing their homework, she was doing some housework.
当她的孩子们在做作业时，她在做家务活。
A. Jane was too busy doing her homework.
珍正忙于她的功课。
Now she is doing her homework. But she was watching TV this time yesterday.
现在她正在做作业。但她昨天这个时候正在看电视。
He was doing his homework as his mother was doing her housework.
他妈妈在做家务活的时候，他在做作业。
After doing her homework, it was almost 9 PM.
做完家庭作业之后，差不多到晚上九点钟了。
After doing her homework, it was almost 9 PM.
做完家庭作业之后，差不多到晚上九点钟了。
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