状语从句用法详解内容提要：一、时间状语从句二、地点状语从句三、方式状语从句四、程度状语从句五、原因状语从句六、结果状语从句七、目的状语从句八、条件状语从句九、让步状语从句十、比较状语从句一、时间状语从句:1、时间状语从句通常用下列从属连词来引导：after, before, as, once, till, until, (ever) since, when, whenever, while, now (that), as long as, as soon as。
如：Now (that)you’ve gr own up, you must stop this childish behaviour. Whenever we met with difficulties, they came to help us.Come and see us whenever you have time.People do not know the value of health till they lose it.2、有些词，如immediately, directly, instantly 等，当用于as soon as 意义时，也可以引导时间状语从句，如：I got in touch with him immediately I received his letter.My sister came directly she got my message.The machine will start instantly you press the button.I’ll t elephone you directly I hear the news.Will you look for it immediately you get there?3．某些表示时间的名词词组，如the (very) moment ( = as soon as ), the minute ( = as soon as ), the instant ( = as soon as ), the day, the year, the morning, every time, each time, next time, the first time 等，也可以引导时间状语从句，如：I’ll tell you about it the moment you come.I started the instant I heard the report.The instant she saw him she knew he was her brother.Every time I catch a cold, I have pain in my back.I’m going to see him next time he comes to Shenzhen.He left Europe the year World WarⅡbroke out.He had impressed me that way the first time I met him.I started the very moment I got your letter.I’ll tell him the minute (that) he gets here.4．有些关联从属连词，如no sooner …than / hardly …when / scarcely …when / barely …when 等，也能引导时间状语从句。
△如果把no sooner, hardly, scarcely, barely 置于句首，它所连带的这部分就要倒装，如：She had no sooner heard the news than she fainted.= No sooner had she heard the news than she fainted.They had hardly started to work when the trouble began.= Hardly had they started to work when the trouble began.He had scarcely entered the room when the phone rang.= Scarcely had he entered the room when the phone rang.二、地点状语从句:1、地点状语从句常用where, wherever 来引导，如：We will stay where you stay. (where = in the place in which; where 既连接主句与从句，又在从句中作副词修饰谓语stay。
)I found my books where I left them.Wherever he happens to be, John can make himself at home.He will work wherever the people need him.Let me go wherever (= to any place to which) they like (to go).2、有时，- where 构成的复合词也可以引导地点状语从句，如：Everywhere they went, they were kindly received / warmly welcomed. We’ll go anywhere the Party directs us.三、方式状语从句:1、方式状语从句通常由as, as if, as though 来引导，如：You must do the exercises as I show you.Please do exactly as your doctor says.It looks as if it might snow / is going to snow.He acted as if / though nothing had happened.He walked as if he was / were drunk.Mary was behaving as though she h adn’t grown up.2、在非正式文体或口语中，也可用the way (that) (= as = in the way in which), how, like 等来引导，如：Jean doesn’t do it the way I do.She is doing her work the way I like it done.You can do the job how you like.The landlord was watching him like(= just as) a cat watches a mouse. Do you make bread like you make cakes?like 作连词的用法补充说明：1). Conjunction (informal)(非正式)：in the same way that; as同…一样，如People who change countries like they change clothes.换国籍像换衣服一样的人。
2). as though; as if 好像，如同I felt like I'd been kicked by a camel. 我觉得好像被骆驼踢了似的。
四、程度状语从句：程度状语从句可用to such an extent that … / to such a degree that … , to the degree/ extent that, in so far as （“在…的范围内”）等来引导，如：The temperature rose to such an extent that the firemen had to leave theburning building.The temperature lowered to such a degree that the water froze.试比较：The temperature rose so high that the firemen had to leave the burning building.The temperature lowered so much that the water froze.从以上例句可以看出，程度状语从句往往也表示达到某种程度时所引出的结果，所以程度状语从句和结果状语从句在意义上有相通之处。
At that time politicians were not known to the degree that they are today. 那时政治家们并不像今天这样为人所知晓。
I'll help you in so far as I can. 我会尽我所能帮助你。
五、原因状语从句：1、引导原因状语从句最常用的连词是because, since, 和as，所引导的从句可以放在主句之前，也可放在主句之后。
其中because 语势最强，since 次之，as 又次之。
△because通常表示说话人认为这种理由或原因是听话人所不知道的，全句强调的重点在原因上，不在主句表示的结果上。
回答why 提出的问题时，只能用because；在强调句型中也只能用because从句，不能用since, as等，如：Because I can’t se e very well, I have to sit near the front.It was because he was ill that he didn’t go wit h us.It was because he was ill that he didn’t come.△since 和as 引导的句子，重点在主句的内容，其原因或理由在说话人看来已很明显，或已为听话人所熟悉，since 和as 只是一种附带的说明原因，不是对原因进行强调，如：As he is working hard, he is likely to succeed.Since he can’t answer the question, you’d bet ter ask someone else.As / Since he was not at home, I spoke to his brother.Since you insist, I will reconsider the matter.As he was in a hurry, he left his bag at home.△for 是并列连词，它引导的句子只能后置。