You can have a burger, but you can't have fries as well.

你可以吃汉堡包，但不可以同时又吃炸薯条。

《牛津词典》

I can't promise anything, but I'll do what I can.

我不能许诺什么，但会尽力而为。

《牛津词典》

I'll see what I can do but I can't promise anything.

我会去看看能做什么，但不能给予任何承诺。

《牛津词典》

"Consumer confidence is yes, somewhat shaken I would say amongst some of the Singapore populace, but that can't be helped,I think."

VOA: special.2011.03.29

I think this is probably a size of lumber, but you can't get away from the mythology of that number.

我想这可能是木材的一种规格，但是你不得不去想,这数字中的神话意味。

耶鲁公开课 - 1945年后的美国小说课程节选

I've been looking for something similar to it, but I can't find a place that sells it here.

我一直在找像这样的一条裙子，但是我没找到哪里有卖。

Where 实战 - SpeakingMax英语口语达人

The new International Criminal Court, ratified this month, is a de facto message to tyrants and torturers everywhere that they can run but can't hide.

BBC: Henry Kissinger: Haunted by his past

We can fire, we can fine, but we can't do anything else.

NPR: Blackwater CEO Defends Workers in Iraq

"The weather's a challenge for lots of people and we're managing as best we can - we can manage the circumstances but we can't manage the weather, " he told BBC News.

BBC: Isles of Scilly flight disruption sparks concerns