这几个词都可以引导定语从句，that什么时候都可以用。who,whose,whom区别主要在于它的意思上，who表示谁在从句中做主语，whom是它的宾格，在从句中做宾语，whose是谁的，它所代替的应该是一个物主代词或有名词所有格，例如：The girl who helps me is my sister.who做的是help的主语； The girl whom I help is my sister.whom 做的是help 的宾语；The girl whose bag is red is my sister.whose 代替的是the girl's.
The woman who (that) is speaking to my teacher is my mother.
The woman whom my teacher is talking with is my mother.
The woman whose girl is my classmate is my teacher.
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