YOU SAID:

i need to eat all the bananas

INTO JAPANESE

私はすべてのバナナを食べる必要があります

BACK INTO ENGLISH

I have to eat all the bananas

INTO JAPANESE

私はすべてのバナナを食べなければならない

BACK INTO ENGLISH

I have to eat all the bananas.

INTO JAPANESE

私はすべてのバナナを食べなければなりません。

BACK INTO ENGLISH

I have to eat all the bananas.