we were having a party when the train started 用while 改为同义句

we were having a party when the train started 用while 改为同义句 We were having a party when the rain started.(改为同义句) _______ we were very sad when we heard of the bad news.改为同义句 We were We were having fun in the park when you called me 同义句 how about having a party?(改为同义句) They are having a good time at the party now.（改为同义句） They ar 译We were having a party while my neighbour is sleeping. The party started half an hour ago.(改为同义句）The party ( ) ( ) We were doing our homework when the lights went out.改为同义句 We were amdzed when heard the bad news.（改为同义句） when we were having the party,i met him.为什么要过去进行时 ( )we were having breakfast,he came in.A.while B.when C.afte