标题：时间状语从句
时间状语
时间状语从句
一般现在时 every…, sometimes, at …, on Sunday, 
一般过去时yesterday, last week, an hour ago, the other day, in 1982, just now 
一般将来时 next…, tomorrow, in+时间, 
现在完成时 for, since, so far, ever, never, just, yet, till/until, up to now, in past years, always, recently 
过去完成时before, by, until, when, after, once, as soon as 
过去进行时 this morning, the whole morning, all day, yesterday, from nine to ten last evening… when, while 
将来进行时 soon, tomorrow, this evening, on Sunday, by this time, tomorrow, in two days, tomorrow evening
从属连词
时间状语从句
引导时间状语从句的普通类从属连词有when（当……时），while（在……期间），as（当……，一边……一边……），before（在……之前），after（在……之后），since（从……以来），till/until（直到），whenever（无论何时），as soon as（一……就）等。如：
When I went into the classroom, he was reading. 当我走进教室时，他正在看书。
He read a newspaper as he went along. 他边走边看报纸。
We must strike while the iron is hot. 我们必须趁热打铁。
I will tell you after they leave. 等他们走后我再告诉你。
I told him to come back whenever he wants to. 我告诉他什么时候想回来就回来。
I waited till/until she was back. 我一直等到她回来。
Once time is gone, you will never get it back. 时间一旦失去就再也得不到了
注意：在时间状语从句中，不能用一般将来时、过去将来时态或将来完成时，而要用相应的一般现在时态、一般过去时或现在完成时来代替。如：
I’ll telephone you as soon as I get there. 我一到达那里就打电话给你。
She said she would phone me as soon as she got there. 她说她一到达那里就给我电话。
Don’t get off the bus until it has stopped. 等车停稳后才下车。
一词多义
时间状语从句
一、对before从句的理解
before的本意为“在……之前”，根据具体语境还可理解为“还没来得及/还没有……就……，趁着还没……就……，不知不觉就……，……才……”等。如：
I had not sat long before he came back. 我没坐多久他就回来了。
He almost knocked me down before he saw me. 他几乎把我撞倒才看到我。
Before I could get in a word, he measured me. 我还来得及插话，他就给我量好了尺寸。
I’ll water the flowers before it gets dark. 我要趁着天还没黑把花浇好水。
Be a pupil before you become a teacher. 先做学生，后做先生。
Time passed quickly and three months went by before she knew it. 时间过得飞快，她不知不觉就在那里度过了三个月
I will die before I will betray my country. 我宁可死也不会背叛我的国家。
二、对since从句的理解
1. since从句的谓语动词是终止性动词照字面意思理解。如：
I’ve been feeling down since I lost my job. 自从失去工作后,我的情绪一直处于低潮。
2. since从句谓语动词延续性动词，且为现在完成时时，仍然按字面意思理解。如：
She has never come to see me since I have lived in the city. 自从我住到城里，她就一直不来看我。
3. since从句谓语动词延续性动词，且为一般过去时时，按与字面意思相反的意思理解。如：
I have made great progress since I was ill. 我自病愈以来取得了很大的进步。
4. since前有ever，或从句谓语动词是be且后接表示人成长过程中的某个阶段或年龄的名词、形容词时，仍然按字面意思理解。如：
I have lived here ever since I was a child. 我从还是个孩子时就一直住在这儿。
三、对till/until从句的理解
1. 主句为肯定式，主句谓语动词必须为持续性动词，且该动词所表示的动作或状态一直延续到until/till从句所表示的时间为止，可译作“（直）到……”。如：
He waited until/till I returned. 他一直等到我回来。
2. 主句为否定式（包括含no, nobody, nothing, never, hardly, little等否定词的肯定句），若主句谓语动词是非持续性动词，则该动词所表示的动作在until/till从句表示的时间开始发生。一般先译从句“直到……”，后译主句，not 译成“才”，即“直到……才……”。如：
His mother didn’t leave until/till he was asleep. 直到他睡着了，他母亲才离开。
Nobody can leave until/till the meeting is over. 直到散会才能离开。
3. 主句为否定式，若主句谓语动词是持续性动词，则须根据上下文去理解until/till从句的含义，一般译为“直到……才……”或“没有到……”。如：
He didn’t wait until/till I returned. 他没有等到我回来。
She didn’t sleep until/till I returned. 她直到我回来才睡着。
与强调句对比
时间状语从句
强调句的句型是： 
It is (was) 被强调部分+ that (who) + 句子其他部分
It was seven o'clock when we reached the station.（状语从句） 
=It was "at" seven o'clock "that" we reached the station.(强调句，定语从句） 
强调句和时间状语从句的区别是：时间状语从句可以去掉，不影响句子的完整性。而强调句that/who引导的句子是不能去掉的，否则句子就不完整了，单独的“It was at seven o'clock”是错误的。 
时间状语从句和定语从句的区别其实跟上面说的是一样的，强调句型其实就是一种特殊的定语从句。本身最简单的表达法是：We reached the station at seven o'clock.然后为了强调"at seven o'clock",就变成了强调句It was "at seven o'clock" that we reached the staion，同时它也是定语从句：从句“that we reached the staion”修饰的是it=the time.
时态问题
时间状语从句
时间状语从句常用的连词有：when，as，while，before，after，since，till，until，as soon as，once。 
【例】 
Before I could get in a word, he had already given orders. 
我还来不及插话，他已经吩咐下去了。 
After the students were all in the lab, the professor brought out three bottles. 
在学生们全进入实验室后，教授拿出三个瓶子来。 
学习时间状语从句应注意以下几点： 
（1）时间状语从句中一般不使用将来时态，尽管主句使用将来时态，一般使用一般现在时态或现在完成时态。 
【例】 
I'll go on with the work when I come back tomorrow. 
我明天回来，我将继续做这项工作。 
Please tell him about it when you see him back. 
你看到他回来，就告诉他这件事。 
（2）till/until引导时间状语从句，主句的谓语动词如是延续动词，可使用否定或不用否定，如果是不延续动词，必须使用否定形式。 
【例】 
He didn't go to bed until it was 12 o'clock last night. 
他昨晚十二点才上床睡觉。 
They worked until it was dark. 
他们一直工作到天黑。 
（3）as soon as, the moment, every time, each time, the minute, the instant, the day, the week, the year, the first time,next time, any time, the last time, all the time, from the time, by the time, immediately, instantly, directly等表示时间的词语，后面也可以接时间状语从句，表示“一……就……”。 
【例】 
I recognized you the minute I saw you. 
我一见到你，就认出了你。 
By the time he was fourteen, he had built his own lab. 
到他十四岁的时候，他已建起自己的实验室。 
（4）主句使用过去进行时或过去完成时，或是was/were about to do Sth. ,后面从句使用when从句，而且谓语动词使用一般过去时，这时when不当“当……时候”解，而当“突然”解。 
【例】 
They were working in the fields when it began to rain. 
他们在地里正干着活时，天突然下起雨来。 
He was about to leave when the telephone rang. 
他刚要走，突然电话铃响了。