初中英语三大从句-总结一. 宾语从句object clause：一. 定义definition：在句子中起宾语作用的从句叫做宾语从句。
二. 连接词connections：that: I think that you can pass the exam.Whether/if: I don’t know what the word means.“Wh”: I don’t know what the word means.I don’t know where he found the book.只用whether的情况：1. 与or not连用：I don’t know whether it’s raining or not.2. 与动词不定式连用：He doesn’t know whether to accept the invitation.3. 连接词前有介词时：It depends on whether he is coming.三. 时态tenses:1. 主句是一般现在时态，从句根据实际情况而定(各种时态均可)She wants to know what he has done for the exam.2.主句是一般过去时态，从句用相应的过去的时态。
1）She said that she was a student.2）She said that she would fly to Japan in a week.3）She said that she had finished her homework already.3. 如果宾语从句说的是客观真理、自然现象或事实时，这时宾语从句要用一般现在时态。
The teacher said that the earth goes round the sun.二. 定语从句Attributive clause：1.定义：在复合句中修饰名词、代词的从句叫定语从句2.先行词指人who /that先行词指物which/ that3. 定语从句一般紧跟被修饰的名词或代词（即先行词）后4.关系代词代替先行词在句子中担当成分，所以从句中不可再出现其他代替先行词的代词5.翻译方法“…. 的”Eg.1. Yesterday we bought a book which is really hard to understand.2. The students who are from Maple Leaf School like learning English. Whom: 先行词指人，则代替先行词在定语从句中充当宾语（包括介词的宾语）, 与who的区别是如果前面带介词则必须用whom1.This is the teacher whom\who we like best.2. I don’t like the boy to whom you are talking.Whose : 指人或物，作定语，表示“…的”eg: Harry is the boy whose mother is our math teacher.While ---表示一种不满情绪，意思是这边在干某种重要的事，而另一边在享受等。
We are cleaning the classroom while they are playing the football.As --- 一边……一边, 随着She was doing her homework as she was listening to the music.As --- 当……时，指一个动作紧接着一个动作发生，从句通常用进行时。
As I was going out, it began to rain.The moment --- 一……就…… =as soon as , immediately,---Did you remember to give Mary the money you owed her?---Yes, I gave her the moment I saw her.Not… until --- 直到……才He didn’t leave the office until he finished the work.Before --- 在……之前The passengers should arrive at the airport an hour before the flight departs. After --- 在…… 之后The customer left the ticket counter after he had a quarrel with the ticket agent.Since ---自从……, 通常主句用现在完成时I have never been there again since I graduated from the university.It is just a week since we arrived here.As soon as --- 一……就……Jack went to school as soon as he got well.No sooner than --- 一……就……no sooner… than… 用于句首要求倒装Hardly …when…Scarcely …when…No sooner had he arrived than he went away again.Once --- 一但……就……Once you see him, you will never forget him.Every time, each time 每次whenever 每当Each time he came to town, he would visit our school.2.条件状语从句引导状语从句的连接词有:If如果, unless除非, as long as只要, As (so) far as --- 据……所知，in case万一, provided that假如, on condition that若是，以…为条件If ---如果If you don’t hurry up, you will miss the plane.Unless --- 如果不, 除非=if notWe can’t get there on time unless we book the earliest flightAs long as --- 只要We will succeed as long as we keep on trying.As (so) far as --- 据……所知As far as I know, he speaks English very well.In case --- 假使, 如果The plane cannot take off in case it rains.Provided that 如果,有时省略thatThe plane will be in good condition provided that it is taken care of carefully. On condition that --- 条件是…He said that he would come to the meeting on condition that no one asked him to speak.注:主从句的动作发生在将来时，则主句用将来时, 从句用一般现在时。
If he arrives tomorrow, I will be waiting for him at the airport.3.地点状语从句地点状语从句只有两个连词: Where, whereverWhere --- 在……地方Where there is a will, there is a way.Wherever --- 无论哪里Wherever you are, I will be right there waiting for you.4.原因状语从句because, as, since, now that, 和considering that, seeing that 这六个连词都用于表示表示原因, 但在语气上一个比一个弱.Because --- 因为,通常从句放在主句后.Mr Smith was very upset because he couldn’t find his luggage.As --- 因为, 通常放在句首As he is honest and modest, all his friends like him.Since ---既然因语气较弱, 常译为既然(众所周知的原因)Since everybody has come, we can set off.Now that --- 既然Now that you are here, you can join us.considering that --- 顾及到Considering that they are just beginners, they are doing quite a good job. seeing that --- 由于Seeing (that) quite a few people were absent, we decided toput the meeting off.5.结果状语从句引导结果状语从句的连词有：that, so that, so…that…such…thatSo… that --- 太……以至于so 后面应用形容词或副词, 有时省略so只用that Boeing 747 is so large that people like to call it jet bomb喷气炸弹.So that --- 因而，以便，为了有时so 可以省去Speak louder please so that the people at the back can hear you.Such …that… ---太……以至于用法与so…that相同，但such 后面应用名词。
The foreign visitor was such a fast speaker that nobody could understand him.6.目的状语从句引导目的状语从句的主要连词有: that, so that, in order that, for fear that, lest(So) that --- 以便, 从句中常常使用一些情态动词，如：can, could, may, might, should等Let’s take the front seats (so) that we may see more clearly.in order that --- 为了, 与so that 相同从句中常常使用一些情态动词，如：can, could, may, might, should等School was closed early in order that the children might go home ahead of the storm.for fear that --- 生怕; 为了防止(某事发生)He took the name down for fear that he should forget it.in case --- 万一You should bring a dictionary in case you need it.Lest --- 以防万一The man decided to tell his boss the fact lest he would be angry with him.7. 让步状语从句引导让步状语从句的连词有：Although, though, as, even if, even though, no matter, however, whatever, while, whether.Although, though ---虽然although 和though 可以互换，但although 常放在句首。