she may be a teacher ,can't she ?错~she may be a teacher ,isn't she? 为什么要用isn't?

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she may be a teacher ,can't she ?错~she may be a teacher ,isn't she? 为什么要用isn't?
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she may be a teacher ,can't she ?错~she may be a teacher ,isn't she? 为什么要用isn't?
she may be a teacher ,can't she ?错~she may be a teacher ,isn't she? 为什么要用isn't?

she may be a teacher ,can't she ?错~she may be a teacher ,isn't she? 为什么要用isn't?
she may be a teacher 意思应该是 她可能是一位老师
你所要判断的是 她是否 是 一位老师.
所以在反意疑问句中,也应该用这个 是 来提问.
在前文用就是be,也就是要is了.
如果用can't she.意思则为,她有没有可能是一位老师.

前面用了be

这就是英文的特点啊,正话反问,反话正问

因为前句表示可能,猜测,
如果用can't表示may作情态动词用!

may是情态动词, be 是系动词
在反意疑问句中应提问系动词,非情态动词

句子是表示对现在事实的猜测,所以用isn't...