Unit 1 Grammar and usage 状语从句学案--高中英语牛津译林版（2020）选择性必修第四册.docx

状语从句 eq \a\vs4\al(一、 状语从句中的省略) 　　　在状语从句(主要是时间、地点、方式和让步状语从句)中，如果从句的主语与主句的主语相一致并且含有be动词时，可以把从句的主语和be动词一起省略。可以使用这种结构的引导词主要有：if, when, while, unless, once, until, although等。例如： (1)While__(she__was)__listening to the radio, she fell asleep. 当在听收音机的时候，她睡着了。 (2)Once__(I__was)__off that long street, I found myself in some very poor quarters. 一旦离开了那长长的街道，我发现自己置身到了一些很贫困的区域。 (3)When__(she__was)__leaving the house, she was heard to make some commonplace remarks to her husband. 当她离开房子的时候，别人听见她对她的丈夫作了一些平常的评论。 (4)He gave good practical advice when__(he__was)__asked. 当被问及的时候他给出了一些实用的建议。 (5)Dont say anything unless__(you__are)__asked． 除非被问，否则不要说任何话。 (6)If__(it__is)__taken good care of, the bird can live as long as five years. 如果被好好照顾的话，鸟儿可以活到长达5年。 (7)Although__(he__was)__frightened,__he managed to run away. 尽管害怕，他还是成功地逃脱了。 【注意】 一般省略的是主语和be动词，有时也可以是it和be动词，主要在if possible, when necessary等类似的结构。例如： We will do that only when__(it__is)__necessary. 只在有必要的时候我们才会做。 【即时巩固】 (1)When ________ (compare) different cultures, we often pay attention only to the differences without noticing the many similarities. (2)When a tomb is opened, fresh air disturbs the viruses, which, if ________ (breathe) in, can result in illness or even death. 二、 when, while的特殊含义及when固定结构 ◆when的特殊含义及固定结构 1. when作连词引导条件状语从句，意为“在……的情况下，既然” (1)How can we explain it to you when you wont listen? 既然你都不听，我们又怎么向你解释呢？ (2)How did you get there on time when you left here so late? 你这么晚从这儿出发，怎么能准时到达那儿的？ (3)Why do you walk when you have a car? 你既然有车，为什么要步行呢？ (4)How can they learn anything when they spend all their spare time watching TV? 他们把所有的空余时间都用来看电视，又怎么能学到什么呢？ 2. be doing...when...意为“正要做某事……这时……”引导状语从句 I was walking along the road when suddenly someone patted me on the shoulder from behind. 我正在马路上走着，这时忽然有一个人从后面拍拍我的肩膀。 3. be about to do...when...意为“正要做某事……这时……”引导状语从句 (1)We were about to start when it began to rain. 我们正要动身，就在这时下起雨来。 (2)We were about to leave when the light went off. 我们正要出发，这时突然灯灭了。 4. be on the point of doing...