They is in Class One.(改一般疑问句并用否定回答)

问题描述:

They is in Class One.(改一般疑问句并用否定回答)

题目有问题,they说明是复数,be动词怎么可以用is,应该用are
They are in Class One.
一般疑问句:Are they in Class One?
否定句:No,they aren’t (in Class One)括号里的内容可加可不加.