YOU SAID:

You need to go to the store and buy some carrots

INTO JAPANESE

あなたは店に行って、ニンジンを買う必要があります

BACK INTO ENGLISH

You have to go to the store and buy a carrot

INTO JAPANESE

あなたは店に行って、ニンジンを買わなければなりません

BACK INTO ENGLISH

You have to go to the store and buy a carrot