高考英语语法——状语从句（共39张PPT）

高考英语语法 状语从句 状语从句 分类 结果状语从句 地点状语从句 目的状语从句 条件状语从句 时间状语从句 原因状语从句 让步状语从句 比较状语从句 方式状语从句 时间状语从句 when/while/as when意为“当……时候”，从句的动作与主句的动作同时发生或是先于主句动作。既可指一段时间也可指时间点，可接延续性动词或者短暂性动词。 while表示一个时间段，只能与延续性动词连用，也可以表示对比。 as“一边……一边……”，强调两个动作同时发生，也可以表示“随着”。 While (as) he was studying, his brother was sleeping. When (as) he arrives, I will inform him of it. The girls sang happily as they walked around the lake. As time goes on, he is getting fatter and fatter. before和after before意为“在……之前”，表示从句的动作发生在主句动作之后。after意为“在……之后”，表示从句的动作发生在主句动作之前。 He had done good preparations before he went to college. After he had tried many times and failed in the end, he gave up. until和till 表示“直到……、到……为止”，表示一个动作持续到某一时刻为止。二者用法相近，但在句首时只能用until。在肯定句中主句要用延续性动词，表示“直到……”；在否定句中，可和非延续性动词连用，not...until...表示“直到……才”。 He waited at home until/till it stopped raining. Until all the lights in the street had been off, the boy went home. He appeared until I waited for a long time.（错） He didn't appear until/before I waited for a long time.（正