While telling someone to "let them know if there's anything you can do" is generous, helping 3 them and offering help in specific ways makes them more likely to take you up on your offer.

虽然告诉某人“让他们知道你能做什么”很慷慨，但帮助他们，并以具体的方式提供帮助，会令他们更有可能接受你的帮助。

youdao

And while other countries, especially France, claim to offer generous grants to help alleviate translation costs, I personally have never encountered one.

FORBES: Swedish Crime Fiction and the Trouble With Translation

And I thanked him for the very generous offer of boom and skimmers coming from Japan that can help in what is going to be a very lengthy process of cleaning up the Gulf in the wake of the oil spill.

WHITEHOUSE: President Obama & Prime Minister Kan at G20 Summit