另一种追逐
形容词 certainfixedgivenparticular 副词 certainlynecessarilyfor suresurely 其实用must也是可以的 你说的“你一定喜欢他”这句其实很多老外就是这么说的 这样用其实是很地道的 学英语要灵活运用～！
瑶瑶瑶姚
他一定会来 He is sure to come. 那一定不是刘老师 That person can't be Teacher Liu. 一定要掌握英语 You must command English. 你一定喜欢她 You must have fallen in love with her. You must like her.这种表达方法容易引起歧义。可以理解成父母包办婚姻时逼婚的说法，也可以理解成推测的说法。 你一定没吃过这道菜。You couldn't have tasted this dish.有的时候还可以在后面加上点东西，变成You couldn't have tasted this dish，I bet. 昨天你一定没去学校 You definitely didn't go to school yesterday. 或 You couldn't have gone to school yesterday. 他一定还没来,别着急 Take it easy. He can't have been there. 英语里面确实还有一些词表示很肯定的意思，如bet，absolutely，definitely，exactly等
钱小小小疯纸
certain 英[ˈsɜ:tn] 美[ˈsɜ:rtn] adj. 某一; 必然的; 已确定的; pron. [动词用复数] 某些; [例句]She's absolutely certain she's going to make it in the world她坚信自己会出人头地。[其他] 比较级：more certain 最高级：most certain
昆山angelababy
一定是 must be，可能是 may be，might be不可能是 can't be，不可能是在 can be doing sth. ，刚才肯定是must have been doing sth just now，刚才可能是 might be doing sth just now ，以前可能是 may had been，现在一定是 must be sth/ doing sth ，刚才一定是 must have been (话说这和 “刚才肯定是”是一个意思吧...)
