I came in when (while) he was doing his homework.
当他在做家庭作业时，我走了进来。
When they came in, we were doing our homework.
当他们进来时，我们正在做作业。
When his mother came in, he pretended to be doing his homework.
妈妈进来时，他假装正在做作业。
The boy pretended to be doing his homework when his mother came in.
他妈妈进来时那个男孩假装正在做家庭作业。
When his mother came in, he to be doing his homework.
妈妈进来时，他假装正在做作业。
He pretended to be doing his homework when he saw his mother come in.
当他看到妈妈进来的时候假装在做作业。
When I was doing my homework, she came in.
我正在做作业时，她进来了。
I was doing my homework, when he came in.
当他来的时候，我正在做作业。
I was doing my homework when he came in.
当他进来的时候我在写作业。
I was doing my homework when he came in.
当他进来的时候我在写作业。
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