before,after,until的用法与区别?

问题描述:

before,after,until的用法与区别?

before 在...以前 after 在...以后 until 直到before的用法:1. before用作连词时,意思是“在……之前;还没来得及 …… 就”.例如:Before she could move,she heard a great noise,which grew to a terrible roar...★依梦☆小姐,请精简一点