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课件网) 中考英语语法：状语语从句 时间状语从句 条件状语从句 让步状语从句 对比状语从句 原因状语从句 目的状语从句 方式状语从句 地点状语从句 结果状语从句 状语从句 时间状语从句 when, while, as 1) when表示时间点， 具有“时刻”概念；其从句谓语动词多为瞬间动词，终止动词。意为“当…时” When he came in, I was writing. He raised his hat when he saw her. I will write when I have finished the book. (当从句的动作发生于主句动作前，只能用when引导这个从句) 时间状语从句 when, while, as 注意：1. 有时，when引导的时间状语从句也可用 持续性谓语动词，此有“每当(whenever)”的意思。 Don’t be excited when you talk 2. When引导的时间状语从句还可采用进行时态， 但此时主句应用瞬间或终止动词，表示在某一行为持续期间的某一时刻发生另一动作。 When I was writing, he came in. 3. 也可表示“一段时间” （从句，主句中皆不采用 瞬间动词） He liked to swim when he was young. 时间状语从句 when, while, as 2) while 表示时间线，具有（期间）概念；其从句动词必须是持续性动词，常用进行时态。主句动词则可持续或不可持续。意为“ 在……期间；趁着……”。 While he was reading, I was writing.(主句，从句皆为“持续”。不可用when) 时间状语从句 when, while, as 3）as 表示时间的“点”或“线”，兼有“时刻”和“期间”的概念；其从句动词多用持续性动词，但也可用瞬间或终止动词。主要用以表示两个同时发展，变化的事件，状态等，此时意为“随着”；也可表示两个同时发生的动作，状态或两个先后紧密衔接的动作，状态。 时间状语从句 when, while, as As I grow older, I get more optimistic. (同时的发展变化) I looked at him as I passed him. (两个同时发生的瞬间动作，可换用成when) As I was going out, it began to rain. (无内在联系的先后紧接的动作） 时间状语从句 till, until, not…until… 1）until 是的强调形式，但是它们表达的意义是相同的，都表示“直到某时”。不过， 当主句是否定句时，它的意思是“直到……才”，其结构为“not until…” “not…until…”，如果将“not until…” 的结构放在句首，主句需要倒装。 He didn’t go to sleep until 12 last night. Not until 12 last night did he go to sleep. 时间状语从句 till, until, not…until… 2）当主句是肯定句时，till/until意思是“直到 （某时某动作停止了）”，在肯定句中可用 before代替. The students made much noise till/before the teacher came into the classroom. 时间状语从句 till, until, not…until… until可放在句首 till则不行 F: Till they used up all their money, the young couple were very happy. T: Until they used up all their money, the young couple were very happy. 时间状语从句 after, before, since after “在……之后” before “在……之前” 当引出时间状语从句涉及过去完成时态时，应仔细区分主句和从句动作发生的先后，发生在前的用过去完成时态。 Before I finished my homework, I had finished my housework. After I had finished my housework, I finished my homework. 时间状语从句 after, before, since 2) since “自……以来”。它引导时间状语从句时，主句常常使用完成时态。 I have been to Beijing several times since I graduated from college. Since I came here, he has been watching TV. 时间状语从句 hardly/ scarcely; no sooner… than…; as soon as; once “一……就 ... ...
