(主句的动作或状态持续时间较短，不能用ever since)
You have been reading to me ever since James went out. 自从James走后你一直在给我朗读。 (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)
The big clock which used to strike the hours day and night was damaged during the war and has been silent ever since.( ever since可以放在句末， since则不能)
这只一向日夜不停打点报时的大钟在战争中损坏了，从此就一直不响了。
My uncle went to Tibet in 1951. He has been living there ever since.我叔叔于1951年去了西藏，从那以后他一直生活在那里。
Things went well until / till one night an accident happened.事情一切正常直到一天晚上发生意外 I knew nothing about it until / till he told me. 他告诉我了我才知道。 ★until与till及 not…until / till的用法
①until和till都可表示“直到．．．．．．为止”，与持续性动词的肯定式连用。如： He waited until / till we finished our meal.他一直等到我们吃完饭。
②当until和till表示“直到．．．．．．才．．．．．．”时，通常与短暂动词的否定式连用，这时，until和till也可用before代替。如：
I didn’t leave until / till / before she came back.直到她回来，我才离开的。 ③be动词的肯定式和否定式都可以和until或till连用。
④until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 told me, I knew nothing about it.他告诉我了我才知道。 当not until位于句首时，主句中的主语、谓语要使用倒装语序： Not until she came back did I leave. = I didn’t leave until she came back. 在强调句型中一般用until，不用till。如：
It was not until she took off her dark glasses that I realized she was a famous 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： Wuhan lies where the Yangtze and the Han River meet.武汉位于长江和汉水汇合处。 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.(这里where引导的从句不是定语从句) 哪儿有问题，你最好在哪儿做个记号。
He would keep in touch with us wherever he was.他无论在什么地方，总是与我们保持联系。 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）,now (that) (既然), for (由于)considering that（顾及到）, seeing that（由于）等连词引导： I do it because I like it.因为我喜欢我才干。(because不能与 so连用)
He couldn’t have seen me, because I was not there.他不可能见过我，因为当时我不在那儿。 Seeing (that) quite a few people were absent, we decided to put the meeting off.由于好些人都没到会，我们决定延期开会
Now that/Since you are all here, let’s try and reach a decision.既然大家都来了咱们就设法做一个决定吧
As she was ill, she didn’t come to the party.由于病了，她没来参加晚会。
Considering that they are just beginners, they are doing quite a good job.考虑到他们才刚刚学做，他们干得算很不错的了。 ★because, as, for , since 的区别 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not所否定时。
You want to know why I’m leaving? I’m leaving because I’m full. for
for的语气不及because, since, as强，为并列连词，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，或对前一分句进行补充和解释。如果不是因果关系，而是对前面主句的内容加以解释或推断时，只能用for。
It’s morning now, for the birds are singing.（很显然，鸟叫不可能是“现在已是早上”的原因。） 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，但有时却相反。
Seeing all of the children already seated, he said,“Since everyone is here, let’s start.” 4． 目的状语从句
引导目的状语从句的主要连词有: so that（以便）, in order that（为了）, for fear that（以便）,目的状语从句的谓语动词常与情态动词can, could, may, might, should连用
Let’s take the front seats (so) that we may see more clearly.我们坐前排吧，这样我们看得更清楚些。
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。（该从句中一般用情态动词should+动词原形，或省略should） Better take more clothes in case the weather is cold.最好多带些衣服以防天气会冷。 5． 结果状语从句
引导结果状语从句的连词有：that, so that（从句中不带情态动词）, so…that(如此……以致……), such…that(如此……以致……)等。
What has happened that you all look so excited? 发生了什么事，使你们都显得如此兴奋？ He didn’t plan his time well, so that/so he didn’t finish the work in time. 他没把时间计划好，结果没按时完成这项工作。
We left in such a hurry that we forgot to lock the door. 我们走得匆忙，把门都忘了锁了。 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。 Jenny is such a clever girl that all the teachers like her very much = Jenny is so clever a girl that all the teachers like her very much Jenny是如此聪明的女孩，以至老师们都非常喜欢她。
注意：so + 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so,不能用such。
I have had so many falls that I am black and blue all over.我摔了许多跤，以至于浑身青一块紫一块
He has so few friends that he often feels lonely.他朋友很少，所以经常感到孤独。
I had so little money then that I couldn’t afford a little present.我当时囊中羞涩连一份小小礼物都买不起
6． 条件状语从句
表示条件的状语从句可以由if（如果）,unless（除非）, in case（万一）, so /as long as（只要）,
as/ so far as（就……而言）, on condition that（条件是……）suppose（假设）supposing（假设）（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候，从句要用一般现在时。
As/So long as we don’t lose heart, we’ll find a way to overcome the difficulty. 只要我们不灰心，我们就能找到克服困难的方法。
Send us a message in case you have any difficulty.万一你有什么困难，请给我们一个信儿。 If you leave at 6 o’clock tomorrow morning, you’d better get to bed now. 如果你明早6点钟走，你最好现在就上床。
We’ll let you use the room on condition that you keep it clean and tidy. 只要你能保持整洁，我们可以让你使用这个房间。
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. 他会接受这项工作的，除非薪水太少/如果薪水不太少的话。 Suppose/Supposing we can’t get enough food, what shall we do? 假设我们弄不到足够的食物，那我们怎么办？ 7． 方式状语从句
方式状语从句常由as（与……一样）, as if（仿佛）, as though（仿佛）等词引导： Do in Rome as the Romans do.入乡随俗。 Leave things as they are.让一切顺其自然。
She stood at the door as if (=as though) she were waiting for someone.她站在门口，仿佛在等人似的。（由as if或 as though引导的从句中可用虚拟语气） 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：
公开课教案高三英语语法专题复习之状语从句
