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?

be 分为 am is are 它引导的一般疑问句 是把 系动词be 提前 比如：This is a ruler.---Is this a ruler? These are rulers.---Are these rulers? I am a student. ---- Are you a student?

如果句子的动词是行为动词，那么这时候变为一般疑问句的时候就要把do放到前面is就是系动词，do引导行为动词。。。这样理解吗 当句中有be动词（am