We noticed that they were playing football when we went home.改为同义句 We noticed _ _ football when we went home.

问题描述:

We noticed that they were playing football when we went home.改为同义句 We noticed _ _ football when we went home.

they playing谢谢。但是为什么是they playing 而不是they were playing ?notice sb doing sth 看到(注意到)某人正在做某事