I have not doubt that we shall be able to do something for you.
我决不怀疑我们能为你做点什么。
It's one thing to be able to do something; it's another to know how you do it.
能够做一件事是一回事，知道怎么做是另一回事。
I am very grateful for your assistance, and hope that one day I may be able to do something for you in return.
我非常感激你对我的帮助，并希望有一天我能为你做点什么来报答你。
She'll be able to do something for you.
她将有能力为你做点什么。
You only want someone to do something about it. You only want someone to be able to do something about it.
你只希望能有人做点什么，希望有人有这个能力改变些什么。
You only want someone to do something about it. You only want someone to be able to do something about it.
你只希望能有人做点什么，希望有人有这个能力改变些什么。
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