YOU SAID:
あなたは交通に注意しなければいけない。
INTO JAPANESE
あなたは交通に注意しなければいけない。
BACK INTO ENGLISH
You have to be careful with traffic.
INTO JAPANESE
交通には注意しなければなりません。
BACK INTO ENGLISH
You have to be careful with traffic.
That didn't even make that much sense in English.