Are everyone in the classroom now?No,Helen and Mike aren't.哪里错了?

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Are everyone in the classroom now?No,Helen and Mike aren't.哪里错了?

Are everyone in the classroom now?No,Helen and Mike aren't.哪里错了?
Are everyone in the classroom now?No,Helen and Mike aren't.
哪里错了?

Are everyone in the classroom now?No,Helen and Mike aren't.哪里错了?
用Is 不是are,这个是固定用法!