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be动词引导的一般疑问句

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be动词引导的一般疑问句
be动词引导的一般疑问句
e 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 student?
he was doing his housework .----- was he doing his housework?