状语从句经典课件ppt

A. until B. unless C. after D. because
until / till “直到……止”(肯定句，主句是延续 性动词); not…until “直到……才”(否定句，主句是终 止性动词);
until 可用于倒装句和强调句，till不用于句 首。
Not until I returned did she finish her homework.
He was playinຫໍສະໝຸດ Baidu the guitar while his sister was watching TV.
问题2：
1) — Was his father very strict with him when he was at school?
— Yes. He had never praised him C he became one of the top students in his grade. （03 北京春季）
____ D
国卷）
it is needed. （03全
A．unless B．since
C．although D．when
复习when 时要注意比较它与 while 与 as 的区别。
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when, while, as 三者的具体用法关键在于动作发生的时间
及从句的动词。
while 表时间，从句需用延续性动词，不用瞬间动词； when 表时间，从句既可用延续性动词，又可以用瞬间动词； as 表时间，与when 相似，但侧重强调主、从句动作同点或
Where did you study before you joined the army?
2.表示“．．．才”强调从句的动作发生得 晚或慢．
He had walked for a whole day before he found water.
3.表示“还没来得及…就”强调在从 句动作发生之前, 主句动作已发生.
时间状语从句的连词
1.once, as soon as ( immediately, directly, instantly, the minute/moment/instant )
hardly/scarcely … when , no sooner…than
4.表示“趁着没…” “以免”
We want to buy something now before prices go up.
5.表示“不知不觉地…就”常用于句 型before one knew it.
Time passed quickly and three months went by before Aqiao knew it.
6.用在“It was/will be (not)+一段 时间＋before 从句”中，译作“才” “就”
(1) It was not long before he left for the United States. (2) It was three weeks before they arrived at the mountain village. (3) It will be four years before we meet again.
同段进行，可用延续行动词的一般过去式表式过去进行时。 (一边…一边; 随着…)
when, while 后还可以接分词短语。
when 作并列连词，表示一个动作在发生时， 另一个动作接着发生，这时就不能用while、 as。
I was walking on the street when suddenly someone patted me on the shoulder. while 作并列连词，表示两种情况对比。
A. after B. before C. when D. then
2、He made a mistake, but then he corrected
the situation ___C___ it got worse. （03北京）
A. until
B. when C. before D. as
before 从句是高考中的一大热点，从时间概 念上不难作出判断。
A．after B．unless C．until D．When
2) Simon thought his computer was broken
_fo_r_g_oA_t_te_n_
his little to turn it
brother pointed out that on. （05北京春季）
he
had
before 与高考
Someone called me up in the middle of the night, but they hung up __A__I could answer the phone.
A. before B. since C. until D as
1.表示”在…之前”.这时主句和从句两个动 作按时间先后依次发生．
状语从句
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状语从句考点
1、各种从属连词的含义及用法比较； 2、no matter wh- 与 wh-ever 引导的从句的区别； 3、状语从句的时态问题； 4、状语从句的倒装问题； 5、状语从句与其它从句的区别。
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1、时间状语从句
问题1：
Don’t be afraid of asking for help
It was not until I returned home that she finished her homework.
问题3： 1、The American Civil War lasted four years __B____ the North won in the end. (05广东卷)
He fell asleep before I could take off his clothes.
注意：这时before 本身含有否定意义， 从句不能再用否定句．
翻译：铃还没响，学生们就冲出了教室．
The students rushed out of the classroom before the bell rang.