condicional + estilo indirecto + pasiva

Ellos nos dijeron: " si nos las rompéis debéis comprar más".

(estilo directo) They said to us: "if you break them to us you must buy more".

(estilo indirecto) They told us that if we broke them  to them we had to buy more

(voz pasiva) We were told by them that if they were broken to them by us, more had to be bought by us.