be sure 和 for two hours

be sure 和 for two hours in two hours 和for two hours的区别 be sure和know for sure 区别 tom_____from here for about two hours.(be away) 对two hours提问 和对 for two hours提问 都是用how long吗 为什么 get sth.for sure和be sure bored be for sure Be sure 和 make sure 47.She ______ up for two hours.A.has got B.has been C.has be two-hour walk 和two hours' walk be sure of 和 be sure to He will be back after two hours