高一英语从句疑问，希望GGJJ能认真解释下..

that 在定语从句中充当宾语主语可代替which
that 不可以代替你所说的on which···that引导定语从句要做成分的

相信基础的你都知道了，直接说具体问题吧。that不可代替on which等，因为on which, at which和when,where一样，都是副词性。而that是代词（名词性）如：
This is the house that/which I bought last year.(that或which作buy的宾语）
This is the house that/which I lived in last year.( that或which作in 的宾语）
This is the house in which I lived last year.(介词提前时只用which)
This is the house where I lived last year.(where 相当于in which)
This is the house that/which I lived last year.(错误）
明白了吗？

that 可用作宾语或主语。它可以替代which what who .但前有介词时，不能用that .