French language Q&A Forum

Is it correct to say "Il a encore besoin des oiseaux?  

Also, is it correct to say "De quoi est-ce Catherine a besoin?

L'histoire me plaît.  Je n'ai pas besoin d'une réponse.

Would it be wrong to say "il y rentre" instead of the corrected answer in the test " il y retourne"? 

My teacher taught me that une robe blanc et noir would be une robe blanche et noire

Both mean time.  Are there rules for their use?

Good, better, best(bon, meilleur, le/la meilleure).  How is "ma meilleure amie", translated as "my best friend" distinguisablle from "my better friend" except by convention?  I.e. one would never say yare my better friend.