举报
donhaotech
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. 她还没来得及动弹,就听见有很响的声音,接着就成了可怕的隆隆轰鸣声。 2. 用于It + be + 时间段 + before...句型中,意思是“在……之后才……”。例如: It will be five years before I come back. 我五年后才能回来。