(1) Jacoby (game-forcing heart raise).
(2) Roman Key Card Blackwood.
(3) Two keys, no ♥Q.
(4) What exactly do you have in spades?
West leads the♣Q. Hearts are not 4-0. Plan the play.
West leads the ♣2. You play low from dummy and capture East’s jack. At trick two you lead a low club to dummy, both following, so the outstanding trump is the 9. Plan the play.