YOU SAID:

I like pizzas and not pineapple

INTO JAPANESE

私はピザが好きで、パイナップルは好きではない

BACK INTO ENGLISH

I like pizza and i don't like pineapple.

INTO JAPANESE

私はピザが好きで、パイナップルは好きではありません。

BACK INTO ENGLISH

I like pizza and i don't like pineapple.