He"s never seen the president before.添加反意疑问句
问题描述：
He"s never seen the president before.添加反意疑问句
his mother is a (professor) in a university.对打括号的地方提问
Did the boys throw the volleyball on the playground?变为被动语态
The baby kept on crying until he saw his mother.改写同义句
答
①He's never seen the president before,does he?②What does his mother do in a university?③Did the volleyball on the playground are thrown by the boys?④The baby stopped crying when he saw his mother....