She offered a reward to who would find her lost ring.

She offered a reward to who would find her lost ring.

把句子划分一下成分~
She 是主语~
offered是谓语~
a reward 是宾语~
to whoever would find her ring 是介词短语~
介词to 后面跟的应该是一个名词性的从句~如果用who 的话，应该改成She offered a reward to anyone who would find her ring就对了~
记住anyone who =whoever ~

因为找到他ring的人不确定，所以用whoever
若用who 就是特指找到ring的那个人不合适