act on one's behalf
代表某人的行动
on one's behalf和in one's behalf有区别
on one's behalf 和 in one's behalf 很接近，但是有些细微差别。
in one's behalf 用在 in the interest of ...;
on one's behalf 用在 on the part of ...;
Don't trouble to do it on my behalf. (不要为了我去麻烦了。)
He interceded in my behalf. (他替我说情。)
这两句的on one's behalf 和 in one's behalf 互换以后，意思有差别。
Don't trouble to do it on my behalf.
准确的翻译是：不要(代)替我去做这件麻烦事。
如果换成: in
Don't trouble to do it in my behalf.
不要为了我的利益去做这件麻烦事了。
He interceded in my behalf.(他替我说情。)
准确的翻译是：他为我的利益去说情。
如果换成: on
He interceded on my behalf.
他代表我去调解。
behalf的形容词形式和名词形式是什么
behalf 本身就是一个名词，表示利益，维护，支持。没有形容词形式
behalf用法如下:
behalf of 代表
on one's behalf 为…的利益;代表
on behalf of 代表;为了
on our behalf 代表我方
on the behalf of 代表
例句：
1.On behalf of my wife who can't attend this party, I'd say sorry.
2.On behalf of my company, I have the pleasure to offer you help.
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