Tom and I will goto see our teacher,for _____(she) is ill.

问题描述:

Tom and I will goto see our teacher,for _____(she) is ill.
用适当形式填空.答案是she,为什么不是her,介词后面不是加宾格的么?

for 在这里相当于是because引导的是主语从句不是宾语从句,所以用主语而不用宾语.