The girl who(m) we saw yesterday is her sister中先行词作主语还是宾语

The girl who(m) we saw yesterday is her sister中先行词作主语还是宾语
The girl who(m) we saw yesterday is her sister中先行词作主语还是宾语

The girl who(m) we saw yesterday is her sister中先行词作主语还是宾语
先行词the girl 在从句中作宾语.

作定语从句（whom we saw yesterday)的宾语

先行词 指人代替先行词在定语从句中充当宾语 She is the girl with whom 指物代替先行词在定语从句中充当主语 She is the person that \\who we

当然是主语，先行词是“the girl",如果这句话去掉定语从句的修饰，就可以很快看出来