(专业)优秀课件状语从句精讲精析

• 1. It wasn’t until nearly a month later ___ I received the manager’s reply. • A. since B. when C. as D. that
before 2. It was nearly a month _________I received the manager’s reply. when 3. It was nearly 9 o’clock _________I received the manager’s reply. that 4. It was nearly at 9 o’clock _________I received the manager’s reply.
问题5: 1. (03年北京) He made a mistake, but then he corrected the situation ______ C it got worse. A. until B. when C. before D. as
2. (06四川)－Why didn’t you tell him about the meeting? A could say a －He rushed out of the room____I word. A. before B. until C. when D. after B we saw 3. (05北京春) It is almost five years ______ each other last time. A. before B. since C. after D. because
连接词before和since的小结：
一、before含义 1． We had sailed four days and four nights before we saw land. “……才” 2． We hadn’t run a mile before he felt tired. “不到……就” 3． Please write it down before you forget it. “趁……” “还没来得及” 4．Before I could get in a word, he had measured me. 二．Before从句中谓语不用否定式。如： Before they reached the station, the train had gone. 三．1）句型It will be/was＋段时间＋before…“还要过多久才……” 如：It will be two years before he leaves the country. 2）句型It will be/was not＋一段时间＋before…“多久就……” 如： It wasn’t two years before he left the country.
since
在it is/ has been +段时间+since从句中，时间的计 算从since从句的动作完成或状态结束时算起。如： • It is three years since she was in our class. • It is three years since he lived here • 她离开我们班有三年了。 • 他不住这儿有三年了。 • 比较 • it is three years since I smoked a cigar. • It is three years since I began to smoke. 我不吸烟有三年了。 我吸烟有三年了
1.时间状语从句：
引导时间状语从句的连词有：
when, while, as, the moment, before, after, till, until, since, as soon as 等。 请注意 when, while, as 的区别
连接词when的用法小结 1. when引导的时间状语从句的谓语动词 可以是可延续 也可以是表短暂性动作的动词(非延续性)。 如When the film ended, the people went back. When I lived there, I used to go to the seashore. 2. 可用作并列连词，其意义为“那时，这时”，相当于 and at this/that time。常用于下列句式： (刚要……这时突然……) 记忆 Sb. was doing something was about to do sth + when… was on the point of doing sth. had just done sth I was walking along the street , when I met him I was about to fall asleep when my sister came in. 3. 还可以表示原因“既然”，相当于since; considering
※while 含义： While I was walking down the street, I came when across an old friend. ( while =_______) He likes pop music, while I am fond of folk but music. ( while =_______) While I really don’t like art, I find his work although impressive. (while=___________) While there is life there is hope. as long as (while=_______________)
连接词while的用法小结
• 1. while引导的动作必须是持续性的，在……期 间，往往指一段时间。如： • While we were talking, he came in. Please don’t talk so loud while others are working. • 2. while作为并列连词，意为“而，却”，侧重 主句动作和从句动作相对比。We are cleaning the classroom while they are playing the football. • 3. while可表示尽管，相当于although。
• 考点: 易混淆句型 • it is + 时间+ since • before • when • that since • It is five years ______he finished his research. before • It was five years ______he finished his research. that • It was five years later _______he finished his research. • when he got home. • It was 5 o’clock _____ that he got home. • It was at 5 o’clock _____
no sooner… than… 用于句首要求倒装
No sooner had he arrived than he went away again..
Hardly …when… Scarcely …when…
till, until和not…until： 1.until/till引导时间状语从句用于肯定句时，主句的动词 是延续性动词，表示动作或状态一直持续到until/till所 表示的时间，意为“某动作一直延续到某时间点才停 止”。如：We waited until he came. 2．用于否定句时，主句谓语动词是非延续性动词，从句 为肯定，意为“某动作直到某时间才开始”。如： He won’t go to bed till/until she returns. 3．till不可以置于句首，而until可以。如： Until you told me I had no ideaห้องสมุดไป่ตู้of it. 4．not…until句型中的强调和倒装说法： It was not until you told me that I had any idea of it. Not until you told me did I have any idea of it.
定义：
在复合句中由从句表示的状语 称作状语从句，它可以用来修 饰谓语或是整个句子。
准确掌握每一个连词的含义是掌握状语 从句的关键。
• 状语从句的位置比较灵活，有时可以放于 句首，有时可以置于句末。状语从句位于 句首时，其后常用逗号与后面的句子隔开。 • 状语从句可以根据其用途分为：
• 时间状语从句、地点状语从句、原因状语 从句、结果状语从句、目的状语从句、条 件状语从句、让步状语从句、比较状语从 句、方式状语从句。
• 连接词when, while, as的用法区别：
1．while引导的时间状语从句的谓语动词必须是可延续的， 而when引 导的时间状语从句的谓语动词是可延续的，也 可以是表短暂性动作 的动词。如：When/While he was eating his breakfast, he heard the doorbell ring. When I stopped my car, a man came up to me. (不可延续，短暂性动词，只可以用when，不可用while) 2．表示“随着……”，连词用as，不用when或while。如： • As the day went on, the weather got worse. 3．如果主句表示的是短暂动作，而从句用延续性动作的进行时态表示 在一段时间内正在进行的动作时，when, while 与as 可互换使用。 如： When/While/As I was walking down the street, I came across an old friend of mine. 4.从句动作发生在主句动作之前时，只能用when引导这个从句，不可用 as或while。 如 When you have finished your work, you may have a rest. When the children had gone to bed, she began to prepare her lessons.（这个时候的 when= after）