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课件网) 单击此处添加副标题内容 状语从句 单击此处添加标题 时间状语从句 1.when、while和as的用法 when “在……时候”,可与延续性动词或短暂性动词连用;从句动作可以发生在主句动作之前、之后或与主句动作同时发生 while “在……期间；与……同时”,一般只可与延续性动词连用,从句动作与主句动作同时发生 as “当……时；随着”,常与延续性动词连用,从句动作与主句动作同时或几乎同时发生 例句：When I met my boss, I seemed very nervous. One Sunday morning, while the children were reading, I stepped to the doorway of the yard to take a break. 高考题常见陷阱： While I got home, it began to rain. When I got home, it began to rain. √ got 是短暂动词 真题实战： 1. （2023浙江卷）_____ I was about to leave, it began to rain heavily. 2. (2021全国I 卷) _____ the discussion was going on, someone took a photo secretly. 做题方法： 1. 看从句动词--是短暂性还是延续性 2. 是否需要强调“同步进行”或“对比” When While 2.before与since的用法 （1）before表示“在……之前;还未……就……;还没来得及……就……”，常用于以下句型。 It will be+一段时间+before... 多久之后才…… It won't be long before... 不久之后就…… It was+一段时间+before... 过了多久才…… 例句：It didn't take long before he finished his task.(翻译句子) （2）since表示“自从……”,其引导的从句在句中作状语时,主句常用现在完成时或现在完成进行时,从句常用一般过去时。 since表示“自从……以来”,常用于“It is/has been+时间段+since从句”句型。该句型表示“自从……已经多长时间了”,从句的时态常用一般过去时。 3.till、until和not...until...的用法 （1）until/till意为“直到……为止”,表示某动作一直延续到某时间点才停止,此时主句谓语动词是延续性动词且为肯定形式。 例句：We will explore every solution till/until we find an answer. 我们要探寻一切解决方案,直到找到答案为止。 （2）not...until...“直到……才”,表示某动作从某时间点开始发生,主句谓语动词是短暂性动词。 We didn’t realize the danger until it was too late. 4.表示“一……就……;刚……就……”的常用表达 （1）表示“一……就……”的表达有as soon as、immediately、directly、the moment、the minute、 the instant、instantly等。 例句：（2023·新高考Ⅱ卷）I promised to take care of Tiffy and call them as soon as we got to Kansas City. 我答应照顾Tiffy，一到堪萨斯城就给他们打电话。 （2）表示“刚……就……”的表达有no sooner... than...、 hardly/scarcely...when...等。该结构中，主句谓语动词应用过去完成时,而than与when引导的从句谓语动词应用一般过去时。此外,如果no sooner、hardly、scarcely等置于句首,主句应部分倒装。 例句：She had no sooner said it than she burst into tears. =No sooner had she said it than she bursy into tears. Scarcely had the game started when it began to rain. 考点2 让步状语从句 1.although、though、while等常引导让步状语从句。 Though/Although/While regular exercise is very important, it's never a good idea to exercise too close to bedtime. 尽管定期锻炼很重要,但临睡前锻炼绝不是个好主意。 2.as引导的让步状语从句要用倒装结构,即将从句中的表语、状语或动词原形置于句首；若表语是单数名词，前置时要省略冠词。此时as可与though互换。 Child as/though he is, he ... ...
