I konw he is a teacher who is very helpful to us when we have trouble.有没有什么语法错误?

问题描述:

I konw he is a teacher who is very helpful to us when we have trouble.有没有什么语法错误?
用 he is a teacher 造一个复合句还有什么复杂一些的句子,请写下来,

没有,但感觉不大好,的确像是为了造句造出来的句子
He is a teacher who dedicates his life to education,which makes him a respectful man,
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