[deep]

5°major diamond 4°

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Now South what bid? Ty for help me i'm very uncertain 3♦ or 2♠ or better 4♦

[whereagles]

If I'm not mistaken, you play french standard. You should bid the artificial 2NT (coup d'arret) and bid pass/3D over pard's 3D/3C response.

A direct 3D or 4D would show a hand with slam interest.

[bonxie]

Any of four games could be right, so just make a forcing but ambiguous as to strength 2♠ bid to show the fifth spade. Partners rebid will clarify the position.

If he has a minimum reverse with nothing in the black suits he will rebid 3♦ and you can raise

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If he has a double club stopper he will rebid in NT and after a diamond raise will rebid NT

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More rarely he will rebid hearts and you play in that game.

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And probably most unlikely given your club shortage you can get to spades.

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Anytime opener has a better than minimum reverse with plenty of aces you might make slam, but he will know when he has a good hand, concentrate on getting to the right game.

Note in all these examples what a great card that Q♥ is, don't stop short of game.

[Fluffy]

partner will bid 3♠ over 3♦ with 3 cards, don't think rebidding 5 card suits automatically is a good tactic. 3♦ is a better descrption and doesn't preclude spades at all.

if you play 2NT as a weak response I think it is a good moment to use it as Nuno said.