sure 是很爽块地回答可以,一定,无疑的. of course 是理所当然的意思. 两者很多情况下能混用. 举例,必须用sure的时候: He is clever,to be sure,but not very hard-working. She is sure to pass the examination. 必须用 of course的时候: Mothers as a matter of course have much affection for their children. I will write to you of course,but not every week. 祝你中秋快乐!
