Besides 承接先前的語意，提供用意相同卻更重要的資訊。因此，使用 besides 時，前後兩句的主旨必須一致，且將重點微妙地轉到後一句，例如：
Besides being a great piano player, Aunt Sally is a great cook.
Tommy was happy to help me move. Besides, he had nothing better to do.
In addition (to) 原意是數學上的加總，用來表達尚未提到的其他可能，語意上沒有besides 那麼講究，只是附加額外訊息：
In addition to house chores, she has to take care of the kids.
Tommy is coming for dinner. In addition, he will help us move.
