"be sure to do"和"be sure of”有什麼區別答：be sure of 與be sure to do的區別：　　be sure of 和be sure that一樣，主語是人， 主語感到“有把握；確信”； be sure to do的主語可以是人，也可以是物， 表示說話人推測“一定；必然會”。例如：　　He is sure of his success. /He is sure that he will succeed. 他確信他會成功。　　He is sure to succeed. 他一定會成功。(說話人的看法)

besuretodo一般指別人認為主語可以做某事

besureofdoing一般指主語自己認為可以做到某事

You"resuretowinthecompetition.

I"msureofpassingtheexam.

都是確信的意思，be sure of有"有把握”的意思，be sure about是確"信某事" 。 be sure of 確信 例句：She looked over her shoulder to be sure of her footing. 她扭頭看了看後面以確認自已是否站穩了。 be sure about 對......很有把握 例句： You can be sure about their interest in it。 你可以肯定他們對引很感興趣。