初中英语语法总结（从句）英语从句三大类型按一般说法，可分为三大类14种从句。
一,名词性从句1主语从句Whether it's right or not remains to be seen.2宾语从句I wonder whether it's right or not.3同位语从句This is a question whether it's right or not.4表语从句The question is whether it's right or not.二,定语从句1限定性定语从句She is the student who can speak English well.2非限定性定语从句She is the student, who can speak English well. 三,状语从句1时间状语从句The fact will come out when he comes here.2地点状语从句You can go wherever you like.3原因状语从句Pay more attention to your lessons because you are a student.4方式状语从句He walks as if he were a king.5目的状语从句She went to Japan so that she could learn Japanese well. 6结果状语从句She went to Japan so that she learned Japanese well. 7条件状语从句I will understand it if he tells me.8让步状语从句He knows a lot though he is little.1．定语从句There are some old books in the box.The boy dressed in blue is from America.✍分清几个概念：先行词与关系代词/关系副词。
先行词是指定语从句所修饰的中心词；关系代词主要有who, whom, whose, which, that; 关系副词主要有 when,where, why。
关系代词和关系副词有两个作用，一是连接主句和从句的作用，二是在定语从句中做成分。
⏹定语从句分为：限定性定语从句和非限定性定语从句, 限定性定语从句如果去掉会影响句子意义的完整性，非限定性定语从句即使去掉也不会影响句子意义的完整性，如： July is the month when we have a lot of rain.There are many plays (that) I’d like to see.The meeting was put off, which surprised us a lot.This note is left by Mary, who was here a moment ago.1.非限定性定语从句，其作用为：对所修饰的成分作进一步的说明，它与主句用逗号隔开。
此类从句省略后其余部分仍可成立。
在非限定性定语从句中，which可代表前面的整个句子；代表人时只能用who，whom，而不能用that；as也可用作关系代词。
例如:2. telephone，as we know，was the invention of Alexander Graham Bell．3. D．Roosevelt，who died there on April 12，1945．4. in a damp（潮湿的）house for a long time is harmful to one’s health，whichis known to everyone．5.限定性定语从句中that可代表人和事，而which只代表事；二者在从句中作主语或宾语。
that作宾语时常可省略，which则不能，而且其后的“不及物动词+介词’’中的介词不能省略。
which作宾语时，先行词与which之间的介词不能省。
例如：6.first doll that could say“mama”was invented in 1830．7. second half of his voyage was by far the more dangerous part，during whichhe sailed round the Cape Horn合恩角．✍代表all，anything，something，nothing，much等词时，用that而不用which，that作宾语可省略。
例如：care anything that has something to do with it．'d better do something he prefers to do to please him．is the last time we met each other．came across the woman you told me about yesterday．✍who和whom引导的从句用来修饰人，分别作从句的主语和宾语。
where是关系副词，用于表示地点的定语从句，而when用来表示时间。
whose是关系代词，修饰名词作定语。
例如:Ford is the person who is most responsible for developing the idea of mass production．knee is the joint where the thigh bone meets the large bone of the lower leg． next morning， when she came down to breakfast ， Mary was beaming with the pleasure of a new，great discovery．visiting professor is a famous scientist whose son studies in my department．✍注意几点：that可替代who, whom（指人），也可替代which（指物）whose 既可指人又可指物引导定语从句的关系代词紧跟介词做从句的宾语时，不用that,只用which几个例子：Is she the girl that/who sells flowers?The train that/which has just left is for Xi’an.The people (who/that/whom) you were talking to were Russians.The girl to whom I spoke is my cousin.I have never met the boy whose mother is a famous actress.My book is on the table whose legs are broken.He went to China in 1945, when the War World II was over.Look, this is the house where the writer was born.The tool with which he is working is called a wrench(扳手).2．状语从句He swims fast.Nervous, he opened the letter.Legs broken, the soldier crawled back home.She used to stay up until midnight.With a book in his hand, the teacher came in.✍状语从句可分为：时间状语从句(主要由when，whenever，after，before，a5，since，once，until，while等连词引导)，结果状语从句(由so…that和such…that连接)，让步状语从句(由though，although， no matter，even if， however，whatever 等词引导)，原因状语从句(由as，because，since和for引导)，条件状语从句(由if， whether，as long as，provided that等词引导)，地点状语从句(由where引导)，行为方式状语从句(由as引导)。
有时条件状语从句中，主句不可以用将来时，而用一般时代替。
✍状语从句中的“主语+be”可以省略，前提是：从句主语和主句主语一致，且从句谓语“be”省略后的结构为“连词+现在分词／过去分词介词短语／形容词／名词短语”。
) 例如：necessary，I would like to see you in your office.seriously wounded，he never complained．条件状语从句：1）Let's go out for a walk unless you are too tired.(除非,若不；相当于if---not)即：If y ou are too tired,we’ll not go out for a walk.2）You may borrow my book as long as you keep it clean.(只要，表示条件的唯一性)3）Take your umbrella in case it rains.（以防---，以免---）4）I can tell you the truth on condition that you promise to keep a secret.(条件是---)5）Supposing it rains, shall we continue the sports meeting?(如果,假如)6）He won't be against us in the meeting provided/providing that we ask for hisadvice in advance.(假如,除非以……为条件)7）You will be successful in the interview once you have confidence.(一旦---就--)方式状语从句方式状语从句通常由as, (just) as…so…, as if, as though引导。