I'll be grateful for help you/from help you/of help you?
Which one is correct? (if some is correct)

Question

Answer

Are you saying you'd be grateful to help some or that you'd be (or you are) grateful for someone's help?

I'd be happy to help you.=I want to help you.
I'd be grateful for your help.=Thank you for offering to help me (that is, thanks in advance for the help you will give me in the future).
I'm grateful for your help.=Thanks for helping me (present) OR Thanks for having helped me (past).

Of course you can always just say "Thanks. I appreciate it." Less formal and more versatile.

Answer

None of those are correct.

If you are asking for help from someone:   I would be grateful if you can help me.

If someone has already helped you:    I'm grateful for your help.

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