I was watching TV when the teacher came in.
When the teacher came in, I was watching TV .
watch是延续性动词，所以可以用过去进行时；而come是瞬间性动词，只能用一般过去时，并用when表示“当……时”。
when the teacher came in，I was watching TV.
你也是初二的吧 我是初二的哦
男老师： Mr Huang
女老师未婚的： Miss Huang
女老师已婚的：Mrs Huang
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