高考英语状语从句专题复习讲解与练习

高考英语状语从句专题复习 状语从句在句中作状语，修饰主句中的动词、形容词或副词等。状语从句放在主句之前时，常用逗号分开;放在主句之后，一般不用逗号。状语从句按其意义和作用可分为时间、原因、地点、条件、让步、目的、结果、方式、比较等9种。 1.时间状语从句 时间状语从句表示主句动作发生的时间，主要由when，while，as ; before, after; till (until); once, by the time, as soon as, no sooner ... than和hardly ... when及名词词组the moment等引导。 1) when“在……的时候”; while “在……期间”; as “正当……的时候” when意为“在……的时候”，强调“特定时间”。 When spring came, he felt like a trip. When he was eating his breakfast, he heard the doorbell ring. 说明：连词when在状语从句中还有如下几种含义： ①表示突然发生的事，含义为“（正在……时）忽然”。 I was just coming along to see you when I ran into Wilson. I had been working a couple of months when I had a letter from Jane. ②表示过早发生某事，意为“（还没……）就”。此含义有时可用before代替。 I hadn’t been reading for half an hour when I heard steps outside. 我刚读了不到半个小时就听到外面有脚步声。 I had been there little more than a week when I set to work in earnest. ③表示“在……的情况下”，常可译为“虽然”，“既然”，“如果”。 She refuses help when (although) she has many friends. Why do you walk when (since) you have a car? How can I help them to underst