释义：

speak for somebody 表达某人的感情或立场，代言

表示“表达某人的立场，感情和想法等”，如果是 speak for yourself 的话就表达当对方和我持有不同意见时说出自己的意见，“我不同意你的意见”（I don't agree with you）。

例句：

I think I can speak for both of us when I say I'm sorry.
我觉得当我说抱歉时可以代表我们两个人。
I know I speak for Will when I say we've very disappointed.
我知道当我说非常失望时包括了威尔的立场。
I need you to speak for someone who can't speak for herself.
你应该为那些不能为自己辩护的人说话。
Speak for yourself. I really hate to jog.
那是你的想法，我非常讨厌慢跑。

对话：

A: How can I contact the shop's owner?
我怎么才能联系上商店的主人？
B: I'm his son. I can speak for him.
我是他儿子，有什么话就可以对我说。