This is a girl.Her name is Mary.
That is a girl.Her name is Mary.
语法没错。
Are you a boy?
语法没错。
This is a pen,and what's this?This is a pencil.这是钢笔，这是什么？这是铅笔。
This is a pen,and what's that?That is a pencil.这是钢笔，那是什么？那是铅笔。
第一句有点怪。
Is ( he/ she) teacher Gao Hui? 他/她是高慧老师吗？
------刚看到问题补充----
Is ( that) teacher Gao Hui? 那是高慧老师吗？
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