"Merele sunt bune."

Translation: The apples are good.

[AndreiToth2]

It sounds like merele sunta or merele sunte bune

[BobGeorge3]

Indeed it sounds as though sunt changes to sunte ...
Merele sunte bune.

[QIx2TJ1O]

Yes,Merele sun bune. Not bun ori buni.

[SamuelJEdgar]

How do you know which form of good to use?

[Renardo_11]

You have to know the gender of măr = apple; it is neuter, and that means to use feminine forms for the plural. So the form to use is bune.