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Teachers.

I leave it to you.

I'll leave it to you.

Which of these are consider to be correct, when you want to say to someone that everything now is in his/her hand?

Similarly,

I hold you to it.

I'll hold you to it.

In this situation, can you also say like 'Now, it's in your hand.'?

Thank you very much.
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I'll leave it up to you = It's your decision to make

I'll leave it (up) to you to finish this = It's in your hands now. (Note: plural, hands, not hand)

I'll hold you to it = You have made a promises and I expect that you will fulfill that promise.

Do you want some sample situations to use each?
Comments  
Grammar GeekDo you want some sample situations to use each?
Yes, if not too much trouble for you.

Thank you.