YOU SAID:
I know you should probably keep an eye on your bento.
INTO JAPANESE
私はあなたがたぶんあなたのお弁当に注意を向けるべきであることを知っています。
BACK INTO ENGLISH
I know that you should probably pay attention to your lunch.
INTO JAPANESE
私はあなたがおそらくあなたの昼食に注意を払うべきであることを知っています。
BACK INTO ENGLISH
I know that you should probably pay attention to your lunch.
You've done this before, haven't you.