1. whom作疑问代词
Whom did you see?
你见到谁了？
Whom are you writing to?
你在给谁写信？
Whom did he come with?
他和谁一起来？
Whom did he protect?
他保护谁？
2. whom作介词宾语
To whom should I write?
我应当给谁写信？
With whom did she come?
她和谁一道来的？
The foreigner with whom I made friends comes from America.
和我成为朋友的这个外国人来自美国。
The boy to whom John spoke is my brother.
和约翰说话的男孩是我的哥哥。
3. whom+不定式
We can't decide whom to invite.
我们不能决定该邀请谁。
She will tell you whom to choose.
她会告诉你选谁。
They must decide whom to teach.
他们必须决定教谁。
I don't know whom to thank.
我不知道该感谢谁。
4. whom作关系代词
The boy (whom) I lend money to lives in town.
我借钱给他的那个男孩住在镇上。
Where is the person (whom) I saw this morning?
我今天早上看到的那个人在哪里？
The teacher (whom) I like most is from America.
我最喜欢的那个老师来自美国。
The girl (whom) I saw told me to come back today.
我见到的那个姑娘叫我今天再来。