你打电话的时候，我正在修收音机。

While the radio was being repaired, you called me.

youdao

你打电话的时候，我正在洗澡。

I was taking a bath when you called.

youdao

你打电话的时候，我正在修理收音机。

The radio was being repaired when you called me.

youdao

Another situation where you could ask a "Can" question is when you're calling a friend on the telephone.

使用“Can”问句的另一种语境是在你与朋友打电话的时候。

Can 课堂 - SpeakingMax英语口语达人