从属连词 从属连词分为两大类，即引导状语从句的从属连词和引导名词性从句的从属连词。 1、引导状语从句的从属连词 英语中大多数从属连词用来引导状语从句，并且引导的状语从句位置比较灵活，大多位于主句之前或之后皆可，位于主句之前时通常用逗号隔开。从引导状语从句的连词的意义来看，可分为引导时间、原因、结果、目的、让步、条件等名种从句的连词。 （1）引导时间状语从句的从属连词 ①此类连词主要有：when, while, after, before, as, as soon as , now(that), until, till, once, since,whenever, no sooner...than, hardly/barely/scarcely...when等。 When I got to the theatre, I found that they had sold all the tickets.当到达剧院时，我发现票已售完。 We should strike while the iron is hot.我们要趁热打铁。 Since he entered the university, he has made great progress in his studies.进入大学以来，他在学业上已经取得了很大进步。 They kept on working until it became dark.他们一直工作到天黑。 Once you begin , you must go on. 你一旦开始，就必须继续下去。 You seem to have a ready-made answer, whenever I ask you a question.每逢我问你问题, 你总好象有现成的答案。 Now (that) you are here, you'd better stay.你既然来了，那就不要走了。 No sooner had they got to the field than it began to rain.他们刚到田里就开始下雨了。 Hardly had he set foot on his native land when he felt comfortable.他一踏上祖国的土地就感到心情舒畅。 注意：no sooner, hardly等位于句首时需用倒装语序。 ②every time, each time, next time, the last time, the moment等，引导句子其作用相当于一个时间状语从句。 She felt a thrill the moment she got into the theatre.她一进剧场就感到一种激动。 Every time he got to Beijing, he came to see me.每次他来北京，他都来看我。 （2）引导原因状语从句的从属连词 此类连词主要有 because, as, since, now(that)，等。because引导的从句表示产生某种结果的必然的因果关系，语气较重，可回答 why问句；since语气较轻，常位于句首；as则语气最轻。 We couldn't cross the rive...
