YOU SAID:

walter, we need to cook

INTO JAPANESE

ウォルター、料理をしなきゃ

BACK INTO ENGLISH

Walter, I have to cook.

INTO JAPANESE

ウォルター、料理しなきゃ。

BACK INTO ENGLISH

Walter, you have to cook.

INTO JAPANESE

ウォルター、君は料理をしなくてはならない。

BACK INTO ENGLISH

Walter, you have to cook.