求助一个英语问题He har known this place ___ he was a boy.这个句子中答案填sin

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求助一个英语问题
He har known this place ___ he was a boy.
这个句子中答案填since, 但是我想问的是可以用 when 吗?如果不行,为什么?
急问.谢谢!

不可以,因为前面是现在完成时,如果填when,前面要改成he knew the place when he was a boy
再问：那是说 when 不能用于现在完成时的意思吗
再答：这么说吧，其实都可以，但是是更细化复杂的语法，我估计你现在初高中的语法考核的就是这个知识点（新东方优能教师解答）
再问：那你能稍微讲一下为什么不用when吗？谢谢
再答：你可以这么理解

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