Can I help you with anything? 我能帮你做点什么吗？

　　Why don't you let me help you with that? 你怎么不让我帮帮你？

　　I have to help my son with his homework. 我得帮儿子做作业。

　　Can I help you with anything? 我有什么可以帮你的吗？

　　No, thank you, I'm just looking around.  不用了，谢谢，我就是随便看看。