we heve been good friends since when we were chidren. 本句结构怎么

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we heve been good friends since when we were chidren. 本句结构怎么理解?尤其是“since when"部分.
多谢了！但是语法方面还是不太理解。

本句主句是现在完成时,意思是“我们打小时候起就是好朋友了.”从儿时开始,一直持续到现在,仍然是好朋友.
when we were children是名词性从句,作since的介宾.而since……整体作整句的时间状语.
另外,拼写错了,是have而非heve.

we heve been good friends since when we were chidren. 本句结构怎么 We have been good friends since we met at school. we have been good friends [ ] We （have been） good friends since we met at school.为什么用have we heve a good Shanghai tomorrow的同义句 2.We have been friends since ______. We've been friends since way back. 完形填空Anna and I are good friends since we were children . 改错since then we have been good friends and now write English We first met two years ago,and have been good friends since 1.As a matter of fact,we have been good friends since she be 30.When we were chidren,we__for a swim in summer,if the weat