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