2026届高三英语二轮复习-状语从句-导学案

这是一份2026届高三英语二轮复习-状语从句-导学案，共12页。
状语从句一般分为九大类
_______状语从句_______状语从句_______状语从句_______状语从句 _______状语从句 _______状语从句_______状语从句 比较状语从句 让步状语从句
He heard a knck at the dr when he was ding his hmewrk.
Where there is a will, there is a way.
He came late because he had t lk after his sick mther.
He gt up early s that he culd catch the early bus.
He gt up s early that he caught the early bus.
Yu will be punished if yu dn’t wrk hard.
Yu shuld d as yur parents tell yu t.
He came earlier than I had expected.
Althugh he failed the exam, he didn’t lse heart.
二．状语从句的分类：
1．时间状语从句：
在时间状语从句中，要注意时态一致，一般情况下主句是将来时的时候，从句要用_______________。引导时间状语从句的连词，根据意义和主从句之间的时间关系，可分类如下：
（1）表示同时性，即主从句的谓语动作同时发生或几乎同时发生。
其连词有：when (当…的时候), while (当…的时候), as (当…的时候), as sn as (一…就…), the time (当…的时刻), the mment (当…的时刻), by the time (到…时候为止), next time (下次), the first time (第一次…的时候), the last time (上次…的时候)，immediately (一…就…), instantly (一…就…),directly (一…就…)
以下关联词引起的句子中， hardly /scarcely…when/befre…（刚…就…）, n sner…than…（刚…就…）前面常用_______________ (时态)，后面用_______________ (时态)。
1. Strike while the irn is ht.趁热打铁。
2. ____________________________(我洗地板的时候), yu can be cleaning the windws.
3. ____________________________(我回家的时候), I met an ld schlmate f mine.
4. I’ll ring yu up ____________________________(我一到家).
5. ____________________________(你一旦见过他), yu will never frget him.
6. ________ had we gt int the cuntry ________ it began t rain.
= We had hardly gt int the cuntry when it began t rain.
7. N sner had he cme hme than she started cmplaining.
= He had n sner cme hme than she started cmplaining.
8. She rushed int the rm immediately / the mment she heard the nise.
9. He made fr the dr ________________________________ (一听到敲门声).
10. He left me a gd impressin ________________________(我第一次见他时).
（2）表示先时或后时，即主句的谓语动作发生在从句之前或之后。
主要连词有：after（在……之后），befre（在……之前）, when(=after)等。如：
1. After / When the children had gne t bed, she began t prepare her lessns.
孩子睡觉了以后她开始备课。（从句的动作发生在主句的动作之前，所以从句用了过去完成时）
2. He had learned English fr three years befre he went t Lndn. 他去伦敦之前已学了三年英语。（主句的动作发生在从句的动作之前，所以主句用了过去完成时）
常用句型：
要过很久才… ________________________________________________
用不了多久就… ________________________________________________
过了很久才… ________________________________________________
不久就… ________________________________________________
It will be anther five days ________________________________ (我们才能完成这个任务).
_________________________ (没有过多久) I frgt it all.
He ran ff befre I culd stp him.（我还没来得及阻止他他就跑掉了。）
It will still be tw r three days _______ we finish ur curses.
The huse fell dwn _______ he culd run ut.
The hliday almst came t an end _______ I realized it.
A. when B. befre C. since D. after
（3）表示习惯性、经常性，即从句描述的不是一次性动作，而是经常发生的习惯性动作。
主要连词有________ ________（每次）, each time（每次）, ____________（每当）等。
1. _________________________________(每当我们遇上困难的时候), they came t help us.
2. ______________________________(每次我见到她), she always wears a sweet smile.
3. Every time I went t his huse, he was ut.我每次去他家，他都出去了。
（4）表示持续性或瞬间性
主要连词有：since, ever since (自从), until (直到…才/为止),till (直到…才/为止)
常用句型: It is / has been + 段时间+since…
1. It is just a week since we arrived here. 我们到这儿刚刚一星期。
(主句的动作或状态持续时间较短，不能用ever since)
2. Yu have been reading t me ever since James went ut. (ever 放在since之前是用来表示说话者强调主句动作或状态持续时间长)
3. My uncle went t Tibet in 1951. He has been living there ever since.
It is three years since I smked. ______________________________________
It is three years since I wrked here. ________________________________________
It is three years since I knew him. _____________________________________
4. Things went well until / till ne night an accident happened.事情一切正常直到一天晚上发生意外
5. I knew nthing abut it until / till he tld me. 他告诉我了我才知道。
★until与till及 nt…until / till的用法
①until和till都可表示“直到…为止”，用于_______(肯定 / 否定)句中，主句谓语动词为_________ (延续性 / 终止性) 动词。
He waited until / till we finished ur meal.他一直等到我们吃完饭。
②当until和till表示“直到…才…”时，用于_______(肯定 / 否定)句中，主句谓语动词为_________ (延续性 / 终止性) 动词。这时，until和till也可用befre代替。
I didn’t leave until / till / befre she came back.直到她回来，我才离开的。
③until引导的从句可以放在主句之前或主句之后，但till从句一般不放在句首。如：
Until he tld me, I knew nthing abut it.他告诉我了我才知道。
④当nt until位于句首时，__________ (主句 / 从句) 中的主语、谓语要使用倒装语序：
Nt until she came back did I leave. = I didn’t leave until she came back.
直到你告诉我，我才意识到了我的错误。
____________________________________________________________________________
⑤在强调句型中一般用until，不用till。
It was nt until she tk ff her dark glasses that I realized she was a famus film star.
2． 地点状语从句
地点状语从句是由__________（在…的地方）, ______________（无论哪里）引导的：
1. Wuhan lies where the Yangtze and the Han River meet.武汉位于长江和汉水汇合处。
2. Where there is a will, there is a way.有志者，事竟成。
3. Yu’d better make a mark __________________________________ (在你有问题的地方).
4. He wuld keep in tuch with us _____________________________ (他无论在什么地方).
3． 原因状语从句
表示原因的状语从句可以由as (由于),because (因为), since (既然，由于), nw that (既然), fr (由于), in that等连词引导：
1. I d it because I like it.因为我喜欢我才干。(because不能与 s连用，为什么？)
2. He culdn’t have seen me, _______________________________ (因为我当时没在那儿)..
3.___________________________________ ( 既然大家都在), let’s try and reach a decisin.
4. As she was ill, she didn’t cme t the party.由于病了，她没来参加晚会。
★because, as, fr , since 的区别
4． 目的状语从句
引导目的状语从句的主要连词有: __________ (以便), in rder that (为了), fr fear that (以防), 目的状语从句的谓语动词常与情态动词can, culd, may, might, shuld连用
1). Let’s take the frnt seats s that we may see mre clearly.
2). Schl was clsed early in rder that the children might g hme ahead f the strm.
3). He tk the name dwn fr fear that he shuld frget it.
他把名字写下省得忘了。（该从句中一般用情态动词shuld+动词原形，或省略shuld）
5． 结果状语从句
引导结果状语从句的连词有：(s)that, s…that (如此…以致…), such…that (如此…以致…)等。
1). What has happened that yu all lk s excited?
2). We left in such a hurry that we frgt t lck the dr.
3). The village is s small that it cannt be shwn in the map.
4). Jenny is such a clever girl that all the teachers like her very much
= Jenny is s clever a girl that all the teachers like her very much
注意：s + 形容词/副词 + that从句；such +名词 + that从句。
但是，当名词前有many, much, few, little (少)修饰时，要用s,不能用such。
1). He spke ______ fast that I culdn’t catch up with him.
2). It is _____ fine weather that I decide t g fr an uting.
3). He is ______ a clever by that we all like him.
4). I have had ______ many falls that I am black and blue all ver.
5). He has ______ few friends that he ften feels lnely.
6). I had ______ little mney then that I culdn’t affrd a little present.
7). They are ______ little children that they didn’t knw hw t deal with it.
8). They received ______ little educatin that they didn’t knw hw t deal with it.
6． 条件状语从句
表示条件的状语从句可以由if (如果), nce (一旦…), unless (除非), in case (万一), s /as lng as (只要), as/ s far as (就…而言), n cnditin that (条件是…)。一般情况下当主句是将来时的时候，从句要用一般现在时。
1). _______________________ (只要我们不灰心), we’ll find a way t vercme the difficulty.
2). Send us a message ____________________________________ (万一你有什么困难).
3). If yu leave at 6 ’clck tmrrw mrning, yu’d better get t bed nw.
4). We’ll let yu use the rm _________________________________ (只要你能保持整洁).
5). ___________________________(据我所知), he is an expert n DNA.
6). He’ll accept the jb unless the salary is t lw/ if the salary is nt t lw.
他会接受这项工作的，除非薪水太少/如果薪水不太少的话。
7． 方式状语从句
方式状语从句常由as (与…一样), ____________ / ____________ (仿佛) 等词引导：
1. When in Rme, d as the Rmans d.入乡随俗。
2. Leave things as they are.让一切顺其自然。
3. She std at the dr as if (=as thugh) she were waiting fr smene.
4. He spke as if he were the child’s father.
8． 比较状语从句
比较状语从句常由than (比) , as (与…一样) 等词引导：
1. It rains mre ften in Shanghai than (it des) in Beijing.
2. Our cuntry is as big as the whle f Eurpe (is).
3. The result was nt as/s gd as I had expected.
常见句型：the +比较级+句子，the +比较级+句子
The busier he is, the happier he feels.他越忙越开心。
The sner (it is), the better (it is).
9． 让步状语从句
让步状语从句由althugh (尽管), thugh (尽管), hwever (无论怎样), whatever (无论什么), whever (无论谁), whmever (无论谁), whichever (无论哪个), whenever (无论何时), wherever (无论哪里), whether (是否), n matter (wh, what, where, when) （无论…）, even if / thugh (即使) 等词引导。(while / as)
1. We wn’t be discuraged even if(=even thugh) we fail ten times.
2. It was an exciting game, thugh / althugh n gals were scred.
(thugh, althugh不能与 but连用，为什么？)
3. Whether yu believe it r nt, it’s true.
4. Hwever (=N matter hw) expensive it may be, I’ll take it.
5. While I admit there are prblems, I dn’t agree they can’t be settled.
6. Dn’t let them in, _______________________________ . (不管他们是谁).
7. ________________________ (无论我说什么) r hw I say it, he always thinks I’m wrng.
连词as也可以引导让步状语从句，但从句中要用特殊语序。
Yung as he is, he knws a lt=Thugh he is yung 或Yung thugh he is, he….
____________________________________(尽管他是个孩子), he is afraid f nthing.
____________________________________(尽管我们会失败), we wn’t give up.
____________________________________(尽管她跑得慢), she gt the first place.
一般情况下，unless相当于if…nt，可以互换。如：
I wn’t let yu in unless yu shw me yur pass = I wn’t let yu in if yu dn’t shw me yur pass.如果你不出示通行证，我就不让你进来。
10．省略现象
有些表示时间、地点、条件、方式或让步等的状语从句中，如果谓语含有动词be，主语又和主句中的主语一致，或者主语是it，常把从句中的主语和谓语的一部分（特别是动词be）省略掉。注意状语从句中从句的省略现象
（1）连接词 + 过去分词
1. Dn’t speak until spken t.= Dn’t speak until yu are spken t.
2. Pressure can be increased when needed.= Pressure can be increased when it is needed
3. Unless repaired, the washing machine is n use. =Unless it is repaired, the washing machine is n use.
（2）连词 + 现在分词
Lk ut fr cars when crssing the street(= when yu are crssing …).
（3）连词 + 形容词/其他
常见的有if necessary、if pssible、when necessary、if any等。
1. She hurriedly left the rm as thugh /if angry (= as thugh/if she was /were angry…).她急匆匆地走出屋去，好象很生气的样子。
2. _______ _________ (如果可能的话), I’d like t have tw cpies if it (= if it is pssible,…).
3. _______ _________ (在必要的时候), I will help yu.
Exercises:
1. ________ the bell rang, all the students stpped writing immediately.
2. We were abut t leave ________ it suddenly started t rain heavily.
3. ________ yu have finished yur hmewrk, yu can g ut t play basketball.
4. She has made great prgress ________ she entered Senir Three.
5. It wn’t be lng ________ we knw the results f the cllege entrance exam.
6. He had scarcely arrived at the airprt ________ the plane tk ff.
7. ________ yu had cme earlier, yu wuld have met the famus prfessr.
8. I wn’t attend the party ________ I am specially invited by the hst.
9. Yu will fail the exam ________ yu review yur lessns carefully.
10. ________ rich he may becme, he will never frget his humble rigins.
11. ________ yu say, I will never believe yur wrds again.
12. ________ yu g, yu shuld always keep yur mther’s wrds in mind.
13. He didn’t cme t schl yesterday ________ he was seriusly ill in bed.
14. We all like the new teacher ________ he always makes his classes lively.
15. It was d cld a day ________ we didn’t want t g utdrs.
16. He spke s fast ________ mst f us culdn’t fllw what he said.
17. D ________ the teacher tld yu, r yu will make serius mistakes.
18. Leave the rm ________ it was when yu entered it this mrning.
19. ________ there is a will, there is always a way t slve prblems.
20. I was walking alng the street ________ I came acrss an ld friend.
参考答案
一．状语从句的定义：在复合句中由从句表示的状语称作状语从句，它可以用来修饰动词（包括非谓语动词）、定语或状语，或是整个句子。状语从句通常由一个连词引起，也可以由一个起连词作用的词组引起。
状语从句一般分为九大类
时间状语从句 地点状语从句 原因状语从句 目的状语从句 结果状语从句 条件状语从句 方式状语从句 比较状语从句 让步状语从句
He heard a knck at the dr when he was ding his hmewrk.
Where there is a will, there is a way.
He came late because he had t lk after his sick mther.
He gt up early s that he culd catch the early bus.
He gt up s early that he caught the early bus.
Yu will be punished if yu dn’t wrk hard.
Yu shuld d as yur parents tell yu t.
He came earlier than I had expected.
Althugh he failed the exam, he didn’t lse heart.
二．状语从句的分类：
1．时间状语从句：
在时间状语从句中，要注意时态一致，一般情况下主句是将来时的时候，从句要用一般现在表示将来。引导时间状语从句的连词，根据意义和主从句之间的时间关系，可分类如下：
（1）表示同时性，即主从句的谓语动作同时发生或几乎同时发生。
其连词有：when (当…的时候), while (当…的时候), as (当…的时候), as sn as (一…就…), the time (当…的时刻), the mment (当…的时刻), by the time (到…时候为止), next time (下次), the first time (第一次…的时候), the last time (上次…的时候)，immediately (一…就…), instantly (一…就…),directly (一…就…)
以下关联词引起的句子中， hardly /scarcely…when/befre…（刚…就…）, n sner…than…（刚…就…）前面常用过去完成时态 (时态)，后面用一般过去时态 (时态)。
1. Strike while the irn is ht.趁热打铁。
2. While I am cleaning the flr(我洗地板的时候), yu can be cleaning the windws.
3. When I returned hme(我回家的时候), I met an ld schlmate f mine.
4. I’ll ring yu up as sn as I get hme(我一到家).
5. Once yu see him(你一旦见过他), yu will never frget him.
6. Hardly / Scarcely had we gt int the cuntry when it began t rain.
= We had hardly / scarcely gt int the cuntry when it began t rain.
7. N sner had he cme hme than she started cmplaining.
= He had n sner cme hme than she started cmplaining.
8. She rushed int the rm immediately / the mment she heard the nise.
9. He made fr the dr as sn as he heard the knck at the dr (一听到敲门声).
10. He left me a gd impressin the first time I saw him (我第一次见他时).
（2）表示先时或后时，即主句的谓语动作发生在从句之前或之后。
主要连词有：after（在……之后），befre（在……之前）, when(=after)等。如：
1. After / When the children had gne t bed, she began t prepare her lessns.
孩子睡觉了以后她开始备课。（从句的动作发生在主句的动作之前，所以从句用了过去完成时）
2. He had learned English fr three years befre he went t Lndn. 他去伦敦之前已学了三年英语。（主句的动作发生在从句的动作之前，所以主句用了过去完成时）
常用句型：
要过很久才… It will be lng befre...
用不了多久就… It wn’t be lng befre...
过了很久才… It was lng befre...
不久就… It wasn’t lng befre...
It will be anther five days befre we finish the task (我们才能完成这个任务).
It wasn’t lng befre (没有过多久) I frgt it all.
He ran ff befre I culd stp him.（我还没来得及阻止他他就跑掉了。）
It will still be tw r three days befre we finish ur curses.
The huse fell dwn befre he culd run ut.
The hliday almst came t an end _______ I realized it.
A. when B. befre C. since D. after
（3）表示习惯性、经常性，即从句描述的不是一次性动作，而是经常发生的习惯性动作。
主要连词有every time（每次）, each time（每次）, whenever（每当）等。
1. Whenever we met with difficulties (每当我们遇上困难的时候), they came t help us.
2. Every / Each time I see her (每次我见到她), she always wears a sweet smile.
3. Every time I went t his huse, he was ut.我每次去他家，他都出去了。
（4）表示持续性或瞬间性
主要连词有：since, ever since (自从), until (直到…才/为止),till (直到…才/为止)
常用句型: It is / has been + 段时间+since…
1. It is just a week since we arrived here. 我们到这儿刚刚一星期。
(主句的动作或状态持续时间较短，不能用ever since)
2. Yu have been reading t me ever since James went ut. (ever 放在since之前是用来表示说话者强调主句动作或状态持续时间长)
3. My uncle went t Tibet in 1951. He has been living there ever since.
It is three years since I smked. 我戒烟三年了。
It is three years since I wrked here. 我不在这儿工作已经三年了。
It is three years since I knew him. 我认识他三年了。
4. Things went well until / till ne night an accident happened.事情一切正常直到一天晚上发生意外
5. I knew nthing abut it until / till he tld me. 他告诉我了我才知道。
★until与till及 nt…until / till的用法
①until和till都可表示“直到…为止”，用于_______(肯定 / 否定)句中，主句谓语动词为_________ (延续性 / 终止性) 动词。
He waited until / till we finished ur meal.他一直等到我们吃完饭。
②当until和till表示“直到…才…”时，用于_______(肯定 / 否定)句中，主句谓语动词为_________ (延续性 / 终止性) 动词。这时，until和till也可用befre代替。
I didn’t leave until / till / befre she came back.直到她回来，我才离开的。
③until引导的从句可以放在主句之前或主句之后，但till从句一般不放在句首。如：
Until he tld me, I knew nthing abut it.他告诉我了我才知道。
④当nt until位于句首时，__________ (主句 / 从句) 中的主语、谓语要使用倒装语序：
Nt until she came back did I leave. = I didn’t leave until she came back.
直到你告诉我，我才意识到了我的错误。
Nt until yu tld me did I realize my mistake.
⑤在强调句型中一般用until，不用till。
It was nt until she tk ff her dark glasses that I realized she was a famus film star.
2． 地点状语从句
地点状语从句是由where（在…的地方）, wherever（无论哪里）引导的：
1. Wuhan lies where the Yangtze and the Han River meet.武汉位于长江和汉水汇合处。
2. Where there is a will, there is a way.有志者，事竟成。
3. Yu’d better make a mark where yu have questins (在你有问题的地方).
4. He wuld keep in tuch with us wherever he was (他无论在什么地方).
3． 原因状语从句
表示原因的状语从句可以由as (由于), because (因为), since (既然，由于), nw that (既然), fr (由于), in that等连词引导：
1. I d it because I like it.因为我喜欢我才干。(because不能与 s连用，为什么？)
2. He culdn’t have seen me, fr I wasn’t there at the mment (因为我当时没在那儿).
3.Since everyne is present ( 既然大家都在), let’s try and reach a decisin.
4. As she was ill, she didn’t cme t the party.由于病了，她没来参加晚会。
★because, as, fr , since 的区别
4． 目的状语从句
引导目的状语从句的主要连词有: s that (以便), in rder that (为了), fr fear that (以防), 目的状语从句的谓语动词常与情态动词can, culd, may, might, shuld连用
1). Let’s take the frnt seats s that we may see mre clearly.
2). Schl was clsed early in rder that the children might g hme ahead f the strm.
3). He tk the name dwn fr fear that he shuld frget it.
他把名字写下省得忘了。（该从句中一般用情态动词shuld+动词原形，或省略shuld）
5． 结果状语从句
引导结果状语从句的连词有：(s)that, s…that (如此…以致…), such…that (如此…以致…)等。
1). What has happened that yu all lk s excited?
2). We left in such a hurry that we frgt t lck the dr.
3). The village is s small that it cannt be shwn in the map.
4). Jenny is such a clever girl that all the teachers like her very much
= Jenny is s clever a girl that all the teachers like her very much
注意：s + 形容词/副词 + that从句；such +名词 + that从句。
但是，当名词前有many, much, few, little (少)修饰时，要用s,不能用such。
1). He spke s fast that I culdn’t catch up with him.
2). It is such fine weather that I decide t g fr an uting.
3). He is such a clever by that we all like him.
4). I have had s many falls that I am black and blue all ver.
5). He has s few friends that he ften feels lnely.
6). I had s little mney then that I culdn’t affrd a little present.
7). They are such little children that they didn’t knw hw t deal with it.
8). They received s little educatin that they didn’t knw hw t deal with it.
6． 条件状语从句
表示条件的状语从句可以由if (如果), nce (一旦…), unless (除非), in case (万一), s /as lng as (只要), as/ s far as (就…而言), n cnditin that (条件是…)。一般情况下当主句是将来时的时候，从句要用一般现在时。
1). S / As lng as we dn’t lse heart (只要我们不灰心), we’ll find a way t vercme the difficulty.
2). Send us a message nce yu have any difficulty (万一你有什么困难).
3). If yu leave at 6 ’clck tmrrw mrning, yu’d better get t bed nw.
4). We’ll let yu use the rm n cnditin that yu keep it tidy (只要你能保持整洁).
5). As / S far as I am cncerned (据我所知), he is an expert n DNA.
6). He’ll accept the jb unless the salary is t lw/ if the salary is nt t lw.
他会接受这项工作的，除非薪水太少/如果薪水不太少的话。
7． 方式状语从句
方式状语从句常由as (与…一样), as if / as thugh (仿佛) 等词引导：
1. When in Rme, d as the Rmans d.入乡随俗。
2. Leave things as they are.让一切顺其自然。
3. She std at the dr as if (=as thugh) she were waiting fr smene.
4. He spke as if he were the child’s father.
8． 比较状语从句
比较状语从句常由than (比) , as (与…一样) 等词引导：
1. It rains mre ften in Shanghai than (it des) in Beijing.
2. Our cuntry is as big as the whle f Eurpe (is).
3. The result was nt as/s gd as I had expected.
常见句型：the +比较级+句子，the +比较级+句子
The busier he is, the happier he feels.他越忙越开心。
The sner (it is), the better (it is).
9． 让步状语从句
让步状语从句由althugh (尽管), thugh (尽管), hwever (无论怎样), whatever (无论什么), whever (无论谁), whmever (无论谁), whichever (无论哪个), whenever (无论何时), wherever (无论哪里), whether (是否), n matter (wh, what, where, when) （无论…）, even if / thugh (即使) 等词引导。(while / as)
1. We wn’t be discuraged even if(=even thugh) we fail ten times.
2. It was an exciting game, thugh / althugh n gals were scred.
(thugh, althugh不能与 but连用，为什么？)
3. Whether yu believe it r nt, it’s true.
4. Hwever (=N matter hw) expensive it may be, I’ll take it.
5. While I admit there are prblems, I dn’t agree they can’t be settled.
6. Dn’t let them in, whever they are . (不管他们是谁).
7. Whatever I say (无论我说什么) r hw I say it, he always thinks I’m wrng.
连词as也可以引导让步状语从句，但从句中要用特殊语序。
Yung as he is, he knws a lt=Thugh he is yung 或Yung thugh he is, he….
Child as / thugh he is (尽管他是个孩子), he is afraid f nthing.
Fail as we may (尽管我们会失败), we wn’t give up.
Slwly as she ran (尽管她跑得慢), she gt the first place.
一般情况下，unless相当于if…nt，可以互换。如：
I wn’t let yu in unless yu shw me yur pass = I wn’t let yu in if yu dn’t shw me yur pass.如果你不出示通行证，我就不让你进来。
10．省略现象
有些表示时间、地点、条件、方式或让步等的状语从句中，如果谓语含有动词be，主语又和主句中的主语一致，或者主语是it，常把从句中的主语和谓语的一部分（特别是动词be）省略掉。注意状语从句中从句的省略现象
（1）连接词 + 过去分词
1. Dn’t speak until spken t.= Dn’t speak until yu are spken t.
2. Pressure can be increased when needed.= Pressure can be increased when it is needed
3. Unless repaired, the washing machine is n use. =Unless it is repaired, the washing machine is n use.
（2）连词 + 现在分词
Lk ut fr cars when crssing the street(= when yu are crssing …).
（3）连词 + 形容词/其他
常见的有if necessary、if pssible、when necessary、if any等。
1. She hurriedly left the rm as thugh /if angry (= as thugh/if she was /were angry…).她急匆匆地走出屋去，好象很生气的样子。
2. If pssible (如果可能的话), I’d like t have tw cpies if it (= if it is pssible,…).
3. When necessary (在必要的时候), I will help yu.
Exercises:
1. When/As2. when 3. Once 4. since 5. befre 6. when 7. if 8. Unless 9. unless 10. Hwever 11. Whatever 12. wherever 13. because/as/since 14. because/as 15. that 16. that 17. as 18. as 19. where 20. when类别
用法
例句
because
because语气最强表示不知道的原因时用because,即说话人认为听话人不知道，因此because从句是全句最重要的部分，通常它被置于主句之后。下列情况下只能使用because:
①在回答why的问句时；②在用于强调句型时；
③被nt所否定时。
Yu want t knw why
I’m leaving? I’m leaving because I’m full.
fr
fr的语气不及because, since, as强，引导的分句常放在主句之后，从句前通常用逗号，表示说话者为所做的推断和预测提供理由，或进行补充和解释。
It’s mrning nw, fr the birds are singing.
as/since
表示已经知道的原因时用as或since,即某种原因在说话人看来已经很明显，或已为听话人所熟悉，因此它是句中不很重要的部分。since要比as正式一些，它们通常被置于语句之前。Since 翻译为既然。
Since everyne is here, let’s start.
类别
用法
例句
because
because语气最强表示不知道的原因时用because,即说话人认为听话人不知道，因此because从句是全句最重要的部分，通常它被置于主句之后。下列情况下只能使用because:
①在回答why的问句时；②在用于强调句型时；
③被nt所否定时。
Yu want t knw why
I’m leaving? I’m leaving because I’m full.
fr
fr的语气不及because, since, as强，引导的分句常放在主句之后，从句前通常用逗号，表示说话者为所做的推断和预测提供理由，或进行补充和解释。
It’s mrning nw, fr the birds are singing.
as/since
表示已经知道的原因时用as或since,即某种原因在说话人看来已经很明显，或已为听话人所熟悉，因此它是句中不很重要的部分。since要比as正式一些，它们通常被置于语句之前。Since 翻译为既然。
Since everyne is here, let’s start.