摘要:时间状语从句（Time clauses）一、引导时间状语从句的从属连词引导时间状语从句的从属连词很多，如较基本的有before, after, when, while, as, since, till, until, as soon as 等：Things were different when I wa[阅读全文]

摘要:这类连词主要有：when:Don't get excited when you talk.讲话时别激动。When he got up he felt dizzy.他站起身时感到头晕。When he comes I'll tell him about it.他来时我将把这事告诉他。We were going to the[阅读全文]

摘要:从意思上考虑，介词可分为下面三类：1）引导时间状语的介词at(5 o'clock)            on (Saturday)        &nb[阅读全文]