our teachers always tell us to believe in what we do and who we are if we want to succeed.

问题描述:

our teachers always tell us to believe in what we do and who we are if we want to succeed.
上面的为什么不对?为什么用which代替what?

去掉in,句子就对了.
believe in sth ------往往强调“信仰”
believe sth == have confidence in ------往往强调“相信,对- --有信心”