一个句子，如果有一个或多个成分由句子充当，则它就是复合句其中能够独立存在的句子，称之为主句，主句也是全句的主体;而充当全句的某个成分的句子，则称之为从句，从句不能独立存在因此，我们也把这种存在主从关系的复合句，叫做主从复合句或从句，下面我们就来聊聊关于英语状语从句快速学习?接下来我们就一起去了解一下吧!
英语状语从句快速学习
一个句子，如果有一个或多个成分由句子充当，则它就是复合句。其中能够独立存在的句子，称之为主句，主句也是全句的主体;而充当全句的某个成分的句子，则称之为从句，从句不能独立存在。因此，我们也把这种存在主从关系的复合句，叫做主从复合句或从句。
状语从句：在复合句中作状语,其位置可以在主句前或主句后。状语从句可以分为时间、地点、原因、目的、结果、方式、比较、让步、条件等几种。
时间状从A. 引导词：when, while, as, as soon as, before, after, since, till, until, once, the moment, each time, the minute...
eg. I was studying when the teacher came in.
B. 用法注意：
a. when, while, as:
when 引导时间状从时，从句中的动词可用延续性动词，也可用瞬间动词；while引导时间状从只能用延续性动词，常译为“与。。。同时”或“在。。。期间”，可表达比较之意（句子常用进行时态）；as引导时间状从，表示“一边。。。一边。。。/随着”，有伴随之意。
eg. When I was cooking, someone knocked at the door.
eg. While the boy was playing with his toys, his mother was doing housework.
eg. Tom listened to the music as he did housework. Tom（一边听音乐，一边作家务）
eg. The trees get taller as they grow. (树木随着他们的生长变得越来越高）
b. till, until:
都表示“直到”，常可互换，但till不能置于句首。till一般用于肯定句，前面的动词为延续性动词；until一般用于否定句，构成not...until结构，前面的动词为瞬间动词。
eg. I will wait here till he finishes his job.
eg. You are not allowed to leave until you finish your homework.
c. since:
since引导的时间状从，表示“自。。。以来”，主句一般用现在完成时，从句用一般过去时。
eg. We have lived here for 3 years since I graduated form college.
d. as soon as:
as soon as引导的从句表示从句的动作一发生，主句的动作随即发生，译为“一。。。就。。。”。该从句常用一般现在时表示将来（类似于条件状从）
eg. As soon as he arrives, I will let you know.
条件状从A. 引导词：if, unless, otherwise, as/so long as, only if, on condition that...
eg. If it rains tomorrow, I will not go with you.
B. 用法注意：
a. If 引导条件状从时，用一般现在时表将来，即：“主将从现”。
eg. If it rains tomorrow, I will not go with you.
b. as long as, so long as:
用于条件状从时，表示“只要”，两者可互换；表示“和...一样长”时，as long as 既可用于肯定句，也可用于否定句，而so long as只能用于否定句：
eg. It took three times as long as I had expected. 这件事比我预料的多花了两倍的时间。eg. It didn’t take as/so long as I expected. 花的时间比我预料的短。
eg. So / As long as you work hard,you will make good progress. 只要你努力,你就会取得巨大进步。
原因状从A. 引导词：because, since, as, for, now (that), in that(因为), seeing that
eg. You are not allowed to see the film because you didn’t finish your homework.
B. 用法注意：
a. because, since, as, for:
a) because 表示因果关系的语气最强（其次是since, 最后是as, for），用来回答why引导的问句，所引出的原因往往是听话人所不知道或最感兴趣的，其引导的从句往往比主句显得更重要;
eg. We can’t go outside because of the rain.
b) since引出的原因往往是人们已知的事实，常译作“既然”， 通常放于句首。其引导的从句是次要的，重点在于强调主句；
eg. Since tomorrow is Sunday, let’s go to the park.
c) as与since用法差不多，所引出的理由在说话人看来已经很明显，或已为听话人所熟悉。其引导的从句与主句具有同等的重要性；
eg. She didn’t hear us come in as she was asleep.
d) because, since, as 均可引导从句放于句首，也可引导从句放于句中，但for只能引导从句放于句中，不能放于句首。
eg. I couldn’t go to Beijing as my mother was ill.= As my mother was ill, I couldn’t go to Beijing.
eg. I listened carefully for the speech is very important. (此句中，for不能放于句首）
b. now (that) 译为“既然”，一般用于口语，表示微弱的原因，主、从句因果关系不明显。
eg. Now (that) you have come, you may as well stay.
让步状从A. 引导词：though/ although, even though/ even if, whatever, however, whoever, whichever, wherever, as
eg. Although I gave him some advise, he didn’t take it.
Note: advise为不可数名词
B. 用法注意：
a. athough/ although, even though/ even if:
even though/ even if(尽管；即使), 表示的让步语气比though/ although(虽然)更强烈，一般来说，even though和even if可互换，though和although可互换， 但though可以放于句末，其它三个不能放于句末；
eg. Even if you don’t know that the machine is dangerous, you shouldn’t touch it.
eg. She knew all her friends would be there.She didn't want to go, though.（此处though译为“但是”）
b. Wh-ever
Wh-ever既可引导名词性从句，也可引导让步状从。引导让步状从时可换成” no matter wh-”, 但引导名词性从句时不能互换：
eg. Whatever he says, don’t trust him.= No matter what he says, don’t trust him.
eg. Whatever he said was right. (引导名词性从句，不能换成no matter what)
eg. I don’t believe whatever he said.(引导名词性从句，不能换成no matter what)
c. as 在表示“虽然，尽管”的让步状从中，as 引导的从句置于句首时，须将表语或状语（形容词、副词、分词、实义动词）提前构成倒装句（though引导的让步状从置于句首时可倒装，也可不倒装）：
eg. Child as he is, he knows to help others.
eg. Dislike him as we may, we must acknowledge his greatness.
eg. Lose money as I did, we got a lot of experience.
Note: 主语后的动词通常为may, might, would, did等情态动词或助动词，若表示情态意义，则选用情态动词；若陈述事实，则用did, do等助动词。
目的状从引导词：so that, in order that, in case(万一), for fear that(以免）
eg. Jack was walking quickly so that(in order that) he could arrive at the cinema in time.
结果状从A. 引导词: so...that..., such...that...
eg. It’s so hot that nobody wants to go out.
B. 用法注意：
a. so...that..., such...that...
a) such: such a/an adj. 可数名词单数 that...
such adj. 不可数名词/可数名词复数 that...
b) so: so adj. a/an 可数名词单数 that...
so adj/adv. that...
eg. She is such a nice teacher that all of us love her= She is so nice a teacher that all of us love her.
c) 当名词前有many, much, little, few等修饰时，用so 而不用such:
eg. There are so many people in the room that there is no room for us.
b. so...that...的否定形式可用简单句too...to...或not..enough to...来代替：
eg. He is so young that he can’t go to school.
=He is too young to go to school.
=He is not old enough to go to school.
地点状从引导词：wherever, where
eg. Where there is a will, there is a way. 有志者，事竟成
eg. Where there is a smoke, there is a fire. 无风不起浪
eg. Sit wherever you like.
方式状从引导词：as, as if/as though(犹如，好似)
eg. You should do your homework as Tom did.
eg. Air is to man, as water is to fish.
eg. Jack was lying on the bed as if he was very tired.
比较状从A. 类别：同级比较；比较级；最高级；the 比较级, the 比较级；表示两者间有所比较或选择
B. 用法：
a. 同级比较：
a) 表示比较双方一样：as(副词)...as(连词)...; not so...as/not as...as(否定形式)
as...as之间加adj/adv.原形
eg. I can’t speak English as fast as a native speaker.
Note:
1.此句型中，也可在adj.前或后加n.
eg. Tom is a boy as clever as Jack.
=Tom is as clever a boy as Jack.
=Tom is as a cleaver boy as Jack.
2.也可用as much 不可数n. as或as many 可数n.复数 as表示同级比较：
eg. He has learned as many English words as his brother(has).
b) 表示倍数：twice as...as..., three times as...as..., four times as...as...
此句型表示前者是后者的几倍
eg. Asia is four times as large as Europe.
b. 比较级：
常用句型：主 谓 adj/adv.(比较级) than 比较对象
a) 比较级中用于比较的双方需是同一级别（同级比较）
eg. The weather in Asia is colder than (that) in Europe. (√)
eg. The weather in Asia is colder than Europe. (×)
b) 也可用同级比较替换比较级：
eg. Tom is younger than Jack.
=Tom is not so(as) old as Jack.
c) 在比较级前加上even, much, a little, a bit, a lot, by far等可表示程度更深：
eg. Mr. Ma is much older than Yang.
d) 有些adj.比较级前不加than:superior(优于), inferior(低于), senior(年长), junior(年幼)
eg. His knowledge is inferior to mine.
c. 最高级：
表示某一事物在某一范围内达到最高程度，此句型中常有表示范围的词组：of 可数名词；among 可数名词等。
eg. Yangtze river is the longest among the rivers in China.
eg. Of all the students, Tom works hardest.
d. the 比较级, the 比较级，表示“越来越。。。”（两句后均有主谓结构）
eg. The harder you work, the greater progress you will make.
e. 表示两者间有所比较或选择：would rather V.原 than V.原；prefer to V.原 than V.原
eg. I prefer to stay at home than go to the cinema.
=I would rather stay at home than go to the cinema.
