狀語從句重點是掌握連接詞即可翻譯句子，掌握引導九類狀語從句的有關連接詞的用法特點和意義是學習狀語從句的關鍵，只有記住連接詞就能夠識別是何種狀語從句，從而正確分析句子的結構并理解句子的意思。

時間狀語從句：

when相當于at the time(在......時刻)
一、主句一般過去時+從句一般過去時
i started my dinner when he left 他走之后，我才開始吃晚飯
二、主句一般過去時+從句過去完成時
i started my dineer when he had left
一、二兩句意思區別不大，兩句都表示從句動作先發生，但從句過去完成時更加強調了從句動作先發生。

下面這種和主句、從句沒有關系，只與動作長短有關系，短暫動作用一般過去時，延續動作用過去進行時：
1、主句一般過去時+從句過去進行時 (during the time 當......時候)
the doorbell rang when i was telephoning。 門鈴響的時候，我正在打電話
短暫動作rang用一般過去時，延續動作用過去進行時。
2、主句過去進行時+從句一般過去時 (at the time正在那時(在......時刻))
i was telephoning when the doorbell rang。 我當時正在打電話，突然門鈴響了
when + 短暫動作突然發生時，可以加suddenly。
i was telephoning when suddenly the doorbell rang。

1)i was telephoning Harry when she arrived
2)i telephoned Harry when she arrived
只有主句時態不同，2句強調從句動作先發生，1句強調主句是一個持續動作。

3、主句一般將來時+從句一般現在時
表示將來動作，從句一般現在時表示將來
i'ii speak to him when he arrvies
when還有用法看過去進行時學習筆記

while 意思相當于during that time(在...期間)，從句謂語動詞接延續動詞
when 既可以表示at that time(在...時刻，謂語短暫動詞)，也可以表示during that time(在...期間,謂語延續動詞)

until

until本質思維是表示“一個（主句）動作一直持續到某一個時間點”
until前面的主句或句子的謂語必須是延續性的，until后接的從句謂語須是短暫動詞或時間點
也就是：連詞：主句延續動詞+until+從句短暫動詞
介詞：延續動詞+until+時間點
wait until he comes back
i will be away from my office until next Tuesday (做介詞)
若主句謂語是短暫動詞，則要用否定形式，not......until

一......就結構
有一些時間連詞表達主句的動作和從句的動作相繼發生，兩者之間時間間隔不長，主句從句都用短暫動詞。
從句動作先于主句動作發生:
關系連詞有：as soon as,once,the minute,the moment,the instant,immediately,directly,instantly等
表示將來時，從句用一般現在時表將來，主句用一般將來時
we will leave as soon as it stops raining
表示過去的動作，主句和從句都用一般過去時
it began to rain as soon as i arrived home

其它連詞例句：
it began to rain immediately i arrived home
don't trust those who leave their friends the moment they get into difficulty

主句動作先于從句動作
表示這一時間關系的連詞有：hardly...when,scarcely...when和no sooner...than,一般多用來表示過去的動作，主句多用過去完成時，且常倒裝，從句用一般過去時。可與as soon as等從句、主句互換。
no sooner had i arrive home than it began to rain
it began to rain as soon as i arrived home
no sooner had the storm started than all the lights went out
hardly had i arrived home when it began to rain
scarcely had i started to type my paper when the tlephone rang

地點狀語從句

由where引導，表殼主句的動作發生的場所，where+陳述句

原因狀語從句

原因狀語從句有四個連詞：because,for,as,since
because語氣最強，只有它才能用來回答why的問句，引出的原因一般是聽話人所不知道或最感興趣的，只有because才能被強調詞如only,just或perhaps等來修飾
my friends dislike me because i'm handsome and successful

連詞since表示人們已知的事情，是不需強調的原因，所以學譯為“既然”，通常放在句首
since you are an english major,i guess you can help me with this sentence
既然你是學英語專業的，我猜想你能幫我解決這個句子

as與since用法差不多，表示說話人看來理由已經很明顯，不需要用because強調
as monday is a national holiday,all govenment offices will be closed
由于周一是法定假日，所有政府機關都將休息

for表示推斷的理由，對前面分句的內容加以解釋或說明
it rained last night,for the ground is wet this morning
昨晚下雨了，因為今天早上地都濕了

as和for引導的主、從句，二者處于平等位置
because引導的從句顯得比主句重要，強調原因
since引導的從句顯得次要，而主句重要，以說明將要做什么事

介詞表示因果關系：
because of ,due to,owing to 后面接名詞，不能接從句

目的狀語從句

連詞有：so that,in order that,that
從句中常含may might can could等情態動詞
in order that意為“以便”
i truned off the tv in order that my roommate could study in peace and quiet
so that 意為“以便”
when i was a child,i would take a flashlight to bed with me so that i could read comic books without my parents' knowing about it
其它例句：
we climbed high (so) that we might get a better view
目的狀語從句一般在主句之后，如需強調目的狀語從句，則將其置于句首
in order that my roommate could study in peace and quiet,i turned off the tv

結果狀語從句

連詞：so...that和such...that
從句都放在主句之后
so...that，so后面接形容詞或副詞
the food in our school canteen is so bad that flies go there to lose weight
such...that，such后面接名詞
he is such a good teacher that everyone like him
為了強調可以將主句中的so,such引導的部分置于句首從而構成倒裝結構
so fast does light gravel that it is difficult for us to imagine its speed
正常語序：ligfht travels so fast that it is difficult for us to imagine its speed
so terrible was the storm that the foofs were all ripped off
正常語序：the strom was so terrible that the roofs were all ripped off
such a fool was he that he believed her
he was such a fool that he believed her

條件狀語從句（真實條件句）

常見連詞：if(如果),unless（除非、如果不）
其他條件狀語從句連詞：
suppose (that),supposing (that),providing/provided(that),so long as,as long as,on condition that等

讓步狀語從句

連詞:though,although,even though,even if,此時，主句前不可用but，但可用yet或still
although he tried hard,yet/still he failed.
though he was inexperienced,he did a very good job
表讓步介詞despite,in spite of,for all
in spite of his inexperience,he did a very good job
inspite of his being inexperienced,he did a very good job

while位于句首，一般意為“盡管”，引導讓步狀語從句。

as引導的倒裝句表示讓步

1、形容詞置句首
young as he is,he is knowledgeable 他雖然年輕，但知識淵博
2、副詞置句首
much as i respect him,i can not agree with him 雖然我非常尊重他，但是我仍舊不同意他的意見
again as he failed in doing this experiment,he didn't lose his heart 盡管他的試驗再次失敗了，但是他并不灰心
3、名詞置句著
child as he is,he is knowledgeable
lazy a boy as he is,he is kind to help others (名詞短語)
以上句型中的as可用that,though代替，但較少這樣使用，不可以用although

關于介詞和連詞的進一步說明：
介詞后面可以接名詞、名詞短語、動名詞或what引導的從句
連詞后面可以接完整的陳述句、形容詞（相當于省略句）、分詞（相當于省略句）等

比較狀語從句

連詞as用法
as...as結構前一個as是一個副詞，后一個as才是比較狀語從句的連詞
1、as+形容詞或副詞+as
the work is not as difficult as you think
2、as+形容詞+a(n)+可數句詞單數+as
前一個as做副詞修飾一個形容詞，而這個形容詞同時又修飾一個名詞。注意不定冠詞在形容詞之前
Americans tend to think from small to large.let us take as simple an example as the addressing of envelopes
rarely has a technological development had as great an impact on so many aspects of social,econmic,and cultural development as the growth of electronics.
3、否定句中第一個as可用so代替
this room is not so large as the one we saw
4、為了保持句子平衡，從句還可以用倒裝結構，此時結構是as...as+助動詞+主語
small as it is,the ant is as much a creature as are all other animals on the earth
the computer revolution may well change society as fundamentally as did the industrial revolution

連詞than用法
1、兩個同類事物才可以比較，不是同類事物無法比較
he is taller than i (am)
the weather of the South is wetther than the North. 錯誤
the weather fo South和the North是兩個截然不同的事物，無法比較，只能用南方的天氣和北方的天氣這兩個同類事物才能比較
2、主句中必須有比較級形式出現
there are few electronic applications more likely to raise fears regarding future employment opportunities than rebots3
３、為保持句子平衡，從句可以全部或部分倒裝
結構如下：than+助動詞＋主語
On the whole,ambitious students are more likely to succeed in their studies than are those with little ambition
Foreign-born Asians and Hispanics "have higher rates of intermarriage than do U.S-born whites and blacks"
Ichthyosaurs had a higher chance of being preserved than did terrestrial creatures because,as marine animals,they tended to live in environments less subject to erosion

表示倍數比較三種句型結構
表示倍數關系的連詞：time和twice
1.“倍數+比較級”結構：A is three times bigger(或其他形容詞的比較級) than B
2.“倍數+as...as”結構：A is three times as big(或其他形容詞原級) as B
3.“倍數+名詞“結構：A is three times the size(或其他形容詞對應的名詞形式) of B

the more...,the more句型結構
表示“越...,越...”,將分句中的某個成分變為比較級之后提到句首，這個比較級部分必須是各自的分句中充當一定的成分。

1句中錯誤，比較級部分沒有在句中充當成分。
2句正確比較級部分在句中做狀語。
3句中比較級部分在分句中充當表語，相當于your words are more exact;it is easier for people to understand you。
4句中比較級部分在分句中充當賓語，也是正確的。
前半部分為從句，后半部分是主句，這就是為什么前半句常用一般現在時態，后半句用一般將來時態，類似其他狀語從句“主句用將來時，從句用一般現在時”的規則，別外，翻譯成漢語時，一般先譯從句，后譯主句。

方式狀語從句

連詞：as,like,as if,as though,the way等
When in Rome,do as the Romans do 入鄉隨俗
Do it the way you were taught 按照教給你的那樣做
He looks as though/as if he is an actor 他看上去像一個演員

like用法，這段話很經典：
Work like you don't need the money.
Love like you've never been hurt.
Dance like nobody's watching.
Sing like nobody's listening.
Live like it's heaven on earth.
去工作吧，猶如你不需要金錢。
去愛吧，猶如你從未曾被傷害過。
去舞蹈吧，猶如無人在一旁觀看。
去歌唱吧，猶如無人在一邊諦聽。
熱愛生活吧，猶如這里是人間樂土。

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