是 in came the teacher 还是 in the teacher came

In came the teacher .是对的
表位置,方向的副词（here,there,up down,in out,away 等）置于句首时,如果主语是名词,一般用【全部倒装】语序
如：
Here comes the bus.
Out rushed the children.
但如果主语是代词,不可以倒装.
如：
Here he comes!
此句Out he rushed 的主语是代词,不可以倒装
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