What does the word 'SURE' really mean in English?

source: JamesESL English Lessons     2014年3月24日
http://www.engvid.com/ Are you sure? Did you know that "sure" can mean different things? You can use this word to express agreement OR disbelief. Watch this vocabulary lesson now to learn how! Then take the quiz on www.engvid.com to make sure you understand the lesson. http://www.engvid.com/english-vocabul...