如果你需要什么请不用客气 英文

要看你的语境：
如果是在饭桌上可以说：help yourself please
如果是在招待客人：please make yourself at home
如果是对朋友提供帮助：let me know if you need anything
如果是对情人伴侣： I will always be there if you need me
如果是对客户：we will provide our professional help as you required
如果是对老板：whatever you need, just ask, sir.
就说这么多，总之语境千变万化，语言也得跟着变，还有无数的语境和表达，我就不列举了（说实话，也列不了，呵呵）

Just help yourself if you need anything. 口语的说法，朋友之间可以这样说

最简单的解释是；Help yourself.

Just tell me if you need my help!

Just tell me if you need something!

If you need anything,help yourself, please