I believe I can speak for the whole nation when I say this and compliment you for your work.

VOA: standard.2009.04.12

But now, when you need more, you can't just say I only want the best bottom land there is.

然而当你需要更多土地时,你不能张口就要这片地区最富饶的土地

耶鲁公开课 - 古希腊历史简介课程节选

When you say "I'm sorry" in English, it can mean that you are sorry for something that you've done personally.

当你在英文中使用“I'm sorry”时，它可以表示你对于自己已有的一些行为感到抱歉。

I'm sorry 课堂 - SpeakingMax英语口语达人

Remember you can say "I'm sorry" when you wish to express your regret, your sympathy or ambiguous regret.

记住，当你想表达歉意、同情或是含糊的道歉时，你都可以用“I'm sorry”。

I'm sorry 课堂 - SpeakingMax英语口语达人

When you say, "How can I," it might mean simply, "How can you do something?"

当你说，“How can I”，这可能是非常简单地表示，“我怎么样才能做到呢？”

How can I 课堂 - SpeakingMax英语口语达人

Or you can say "I'm not sure that" when you are uncertain.

或当你没把握时，你可以用 "I'm not sure that"。

I'm sure 课堂 - SpeakingMax英语口语达人