在定语从句中，干系代词who (whom) 和that都可指人和物，在寻常情况下，可以互换使用，但本人列情况下值得注意：
一、用who (whom) 而不必that的情况
(1) 在非限定性定语从句中的先行词指人时，只能用who (whom)。
如：
My sister, who is studying abroad, sent me a beautiful present just before this Christmas. 我姐姐，她在外洋学习，就在圣诞节前给我寄来了标致的礼品。
(2) 当定语从句对指人的先行词举行隔位修饰时，只能用who (whom)。
如：
Do you know the girl in front of the blackboard who is speaking to the students? 你熟悉黑板前方正在给学生们发言的那位女孩子吗？
(3) 抢先行词为people和those时，只能用who (whom)。
如：
Those who want to go there come here please. 那些想去那儿的人请来这边。
(4) 抢先行词为one, ones, anyone, everyone, none, all(指人) 时，只能用who (whom)。
如：
Anyone who is against us is our enemy. 任何反对我们的人就是我们的仇人。
(5) 先行词指人，而干系代词在从句中作主语时，寻常多用who。
如：
The man who came here yesterday said he would come again in a few days. 昨天来这儿的那一局部辩过几天他会再来。
(6) 在there be句型中名词的定语从句多用who (whom)。
如：
There are students in our class who / whom you have met. 我们班有些学生你见过。
(7) 当句子中有两个指人的现行词分散带有两个定语从句时，若一个定语从句的引导词为that, 那么，另一个定语从句的引导词一定为who。
如：
The boy that you met just now is Li Ming’s brother who just graduated from a university. 刚刚你会到的谁人男孩是李明的刚从大学毕业的弟弟。
二、用that 而不必who (whom)的情况
(1) 抢先行词前方有质貌词的最高等或序数词修饰时，引导词只能用that。
如：
The tallest player that plays football for our team is from Shandong. 在为我们队踢足球的最高哪个运倡导来自山东。
(2) 抢先行词前方有only, some, any, no, every, little, few, much, all, very形貌词修饰时，引导词只能用that。如：
He is the only student that said “no” to the teacher. 他是唯一的一个对教师说“不”的学生
(3) 当主句是以who开头的特别疑问句时，引导词只能用that。
如：
Who is woman that you talked with just now? 刚刚跟你发言的那位妇女是谁？
(4) the same as 与 the same that
the same as所引导定语从句的内容与先行词同类而不同物；the same that表现所引导的从句内容与先行词同类同物，即：同一事物。
如：
She is wearing the same coat that I lost a few days ago. 她正穿着我几天前所丧失的上衣。(暗含：她偷了我的上衣)
She is wearing the same coat as I lost a few days ago. 她正穿着跟我几天前所丧失的上衣相反的上衣。(暗含：她所穿的上衣不是我所丧失的那一件)
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