题目内容：

be动词引导的一般疑问句

优质解答

be 分为 am/ is/ are/was/were 它引导的一般疑问句 是把 系动词be 提前 比如：There is a ruler on the desk.---Is there a ruler on the desk?They are at work.---Are they at work?I am a student.---- Are you a...