"当她走进教室的时候"的主语是"她"还是"时候"?这句话用层次分析法怎么划分?

1）首先when是一个“副词”,when单独来看从来都做不了主语.2）when的用法是：when+从句；从句才是一个句子,这个句子里面才有主语.细一点点：when does she come into the classroom.中she是主语.when she came into ...