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1.时刻状语从句：在时刻状语从句中，要留心时态共同，一般情况下主句是将来时的时分，从句要用一般如今时。
As / When I came home, I met an old schoolmate of mine. 我回家的时分遇到了我的一位老同学。
I'll ring you up as soon as I get an answer from him. 我一有他的答复就给你打电话。
Once you see him, you will never forget him. 你一旦见过他，就不会忘了他的。
Whenever we met with difficulties, they came to help us. 每当咱们遇上困难的时分，他们就来帮咱们。
Each time he came to town he would visit our school. 他每次进城，总要来看看咱们的学校。
Every time I went to his house, he was out. 我每次去他家，他都出去了。
It is just a week since we arrived here.（It is /was… since…是常用句型）
咱们到这儿刚刚一星期。（主句的动作或状况持续时刻较短，不能用ever since）
Things went well until/till one night an accident happened. 作业悉数正常，直到有一天晚上发生了意外。
2.地址状语从句
地址状语从句是由where（在……的当地），wherever（不管哪里）引导的：
Wuhan lies where the Yangtze and the Han River meet. 武汉位于长江和汉水集结处。
Where there is a will, there is a way. 有志者，事竟成。
You'd better make a mark where you have any questions.（这儿where引导的从句不是定语从句）哪儿有疑问，你最佳在哪儿做个记号。
He would keep in touch with us wherever he was. 他不管在啥当地，总与咱们坚持联络。
3.缘由状语从句
标明缘由的状语从句可以由as（因为），because（因为），since（已然），now （that）（已然），considering that（顾及到），seeing that（因为）等连词引导：
I do it because I like it. 因为我喜爱我才调。（because不能与so连用）
Seeing (that) quite a few people were absent, we decided to put the meeting off. 因为好些人都没到会，咱们抉择延期开会。
Now that/Since you are all here, let's try and reach a decision. 已然我们都来了，咱们就设法做出一个抉择吧。
As she was ill, she didn't come to the party. 因为病了，她没来参加晚会。
Considering that they are just beginners, they are doing quite a good job. 思考到他们才刚刚学做，他们干得算很不错的了。
4.意图状语从句
引导意图状语从句的首要连词有：that, so that（以便）, in order that（为了）, for fear that（以便）, in case（如果）等，从句中常常运用一些神态动词，如：can, could, may, might, should等。如：
Let's take the front seats (so) that we may see more clearly.
咱们坐前排吧，这样咱们看得更理解些。
School was closed early in order that the children might go home ahead of the storm. 早点儿放学是为了让孩子们在暴风雨到来之前回家。
He took the name down for fear that he should forget it. 他把名字写下省得忘了。
（该从句中一般用神态动词should+动词原形，或省掉should）
Better take more clothes in case the weather is cold. 最佳多带些衣裳以防气候会冷。
5.成果状语从句
引导成果状语从句的连词有：so that（从句中不带神态动词），so…that（如此……致使……），such…that（如此……致使……）等。
He didn't plan his time well, so that/so he didn’t finish the work in time. 他没把时刻方案好，成果没准时结束这项作业。
We left in such a hurry that we forgot to lock the door. 咱们走得匆忙，把门都忘了锁了。（such是描述词，后接名词）
The village is so small that it cannot be shown in the map. 这村子太小，所以这地图上没有。（so是副词，后接描述词或副词）
Jenny is such a clever girl that all the teachers like her very much = Jenny is so clever a girl that…Jenny是如此聪明的女孩，致使教师们都非常喜爱她。
可是，当名词前有many, much, few, little（少）润饰时，要用so，不能用such
。例如：
I have had so many falls that I am black and blue all over. 我摔了许多跤，致使于浑身青一块，紫一块。
He has so few friends that he often feels lonely. 他兄弟很少，所以常常感到孑立。
I had so little money then that I couldn't afford a little present. 我其时囊中羞涩，连一份小小礼物都买不起。
6.条件状语从句
标明条件的状语从句可以由if（假定），unless（除非），in case（如果），so /as long as（只需），as/ so far as（就……而言），on condition that（条件是……），suppose（假定），supposing（假定）（仅用在问句中）等词或词组引导。一般情况下当主句是将来时的时分，从句要用一般如今时。
As/So long as we don't lose heart, we'll find a way to overcome the difficulty. 只需咱们不悲观，咱们就能找到战胜困难的办法。
Send us a message in case you have any difficulty. 如果有啥困难，请给咱们一个信。
If you leave at 6 o'clock tomorrow morning, you'd better get to bed now. 假定你明早6点钟走，你最佳如今就上床。
We'll let you use the room on condition that you keep it clean and tidy. 只需你能坚持规整，咱们可以让你运用这个房间。
As/So far as I know, he is an expert on DNA. 据我所知，他是一个DNA专家。
He'll accept the job unless the salary is too low/ if the salary is not too low. 他会承受这项作业的，除非薪水太少/假定薪水不太少的话。
Suppose/Supposing we can't get enough food, what shall we do? 假定咱们弄不到满足的食物，那咱们怎么办？
7.方法状语从句
方法状语从句常由as（与……相同）， as if（似乎）， as though（似乎）等词引导：
Do in Rome as the Romans do.入乡随俗。Leave things as they are.让悉数顺从其美。
She stood at the door as if （=as though） she were waiting for someone.
她站在门口，似乎在等人似的。（由as if或 as though引导的从句中可用虚拟口气）
8.比照状语从句
比照状语从句常由than（比）， as（与……相同）等词引导：
It rains more often in Shanghai than in Beijing.上海下的雨比北京的多。
Our country is as big as the whole of Europe.咱们的国家同整个欧洲相同大。
The result was not as/so good as I had expected.成果不如我意料的那么好。
The busier he is， the happier he feels.（常见句型）他越忙越开心。
9.让步状语从句
让步状语从句由although（尽管），though（尽管），however（不管怎样），whatever（不管啥），whoever（不管谁），whomever（不管谁），whichever（不管哪个），whenever（不管何时），wherever（不管哪里），whether（是不是），no matter (who, what, where, when, etc)（不管……），even if（即便），even though（即便）等词引导。如：
We won't be discouraged even if (=even though) we fail ten times. 咱们就是失利十次也不悲观。
It was an exciting game, though / although no goals were scored. 那是一场精彩的球赛，尽管一个球都没进。（though， although不能与 but连用）
Whether you believe it or not, it's true. 不管你信不信，这是真的。
However (=No matter how) expensive it may be, I'll take it. 不管它有多贵，我也要买下它。
Don't let them in, whoever(=no matter who) they are.不管他们是谁，别让他们进来。
No matter what I say or how I say it, he always thinks I'm wrong. 不管我说啥或怎么说，他总认为是我错。
连词as也可以引导让步状语从句，但从句中要用特别语序。如：
Young as he is, he knows a lot=Though he is young 或Young though he is, he… 他尽管年青，但懂得许多。
难点释疑：
1.当hardly, scarcely, no sooner位于致使的语句的最初时，常用倒装语序。
No sooner had he arrived there than he fell ill.
Hardly had he finished when someone rose to refute his points.
Scarcely had she fallen asleep when a knock at the door awakened her. 这三组相关词致使的语句中，前面常用曩昔结束时，后边用一般曩昔时。
2.if和unless的用法
一般情况下，unless恰当于if…not，可以交换。如：
I won't let you in unless you show me your pass = I won't let you in if you don't show me your pass. 假定你不出示通行证，我就不让你进来。
