Whlie he was debating this question with the teacher, he learned a lot. 改成

问题描述:

Whlie he was debating this question with the teacher, he learned a lot. 改成
___ this question with his teacher, he learned a lot.

Debating___ this question with his teacher,he learned a lot.
英语中当主句的主语(he)与从句的主语(he)相同,从句中又有be动词(was)时,可以略去从句的主语和be动词,还可以省去连词.
又如:When I am standing here,I am talking to you.
= Standing here,I am talking to you.