sure和certainly的用法和区别 说明基本用法就行 要例句和例句的中文,例句也不要太复杂

sure 既可用做形容词,也可用作副词,作形容词时,意为“肯定,确信,有把握.”常用以下句形.1）be sure of /about 相信,确信.如：I am sure of /about his success .我确信他会成功.2）be sure to 一定,务必 .如：Be sur...