一、含有从句的句子叫做主从复合句，简称复合句。根据从句在主句中所充当的不同成分，从句分为三种：
1 名词性从句（主语从句、表语从句、宾语从句）；
2 形容词性从句（定语从句）；
3 副词性从句（状语从句）
二、引导名词性从句的连接词可分为三类：
连词：that（无任何词意）；whether, if（“是否”）；以上在从句中不作作成分。
连接代词：what, whatever, who, whoever, whom, whose, which, whichever, whomever
连接副词：when, where, how, why, whenever, wherever, however
三、 常见考点：
1．从句的语序：
所有从句都用陈述句语序i h**e no idea when he will come.
2. 宾语从句的时态。
当主句动词是过去时态，从句则要用相应的过去时态，如一般过去时，过去进行时，过去将来时等；当从句表示的是客观真理，科学原理，自然现象，则从句仍用现在时态。例如：
he asked me whether isee) his pen.
the teacher said that the suntr**el) around the earth.
主将从现、主祈从现、主情从现。
i don’t know when hewhen hei’ll let you know.
comes come; comes will come come; will come
3. that的省略问题。
1. 宾语从句的that通常可以省略多个宾语从句时， 只有第一个that可以省略。
2. 引导表语从句、主语从句的that 不可省略。
4. if / whether
只能用whether的情况：
引导主，表从句介词后的宾语从句句中有or not放不定式前。
5. what /that
that在引导名词性从句时，不在句子中做成分，不含疑问意义，也没有实际意义，只起连接作用，在句首时不可以省略。what 在引导名词性从句时，既起连接作用，又在从句中做主语或宾语，在任何情况下都不能省略，它有具体意义，相当于all / everything that。that he will come is certain.
(that不可省略)
what he said is very important to us.
专项练习。1. –do you knowi'm not sure. maybe he is a businessman.
a. who he isb. who is he
c. what he does d. what does he do
2. –where does he come from? -pardon? -i said where __
a. did he come fromb. he came from
c. he comes fromd. does he come from
3. i‘m not sure __he will come back home tomorrow or not.
a. whenb. what c. whether d. where
4. our teacher told us __
a. is the earth roundb. the earth was round
c. the earth is roundd. was the earth round
5. i don’t know __he will come tomorrow, _he comes, i’ll tell you
a. if; whether b. whether; whether c. if; thatd. if; if
6.－i don’t know if he __he will come if it __
a. comes; won’t rainb. will come; doesn’t rain
c. comes; doesn’t raind. will come; won’t rain
7. i will accept the gift is none of your business.
a. ifb. whetherc. whatd. which
8. nobody knew .
a. where he comes b. where he was from
c. where he is from d. where does he come from
9. the reason is i missed the bus.
a. thatb. whenc. why d. what
10she needs is to h**e a good rest.
a. thatb. whatc. whoeverd. the things what
11. themountainisnolonger___itusedtobe.
13. i find __important that we practice english every day.
a. itb. thisc. thatd. what
14.__theywillh**eagookharvestthisyearisstillunknown.
15.__theywillh**eagookharvestthisyearisstillunknown.
高考英语语法讲解名词性从句
名词性从句讲解。i 语序问题。规律一 名词性从句在句中要用陈述语序 ii 引导词的选择。1.从句是陈述句转化而来的，不含有疑问意义。由that 引导且that连词在从句中不作成分。2.从句是由一般疑问句转化而来，含有疑问意义的。由whether，if 引导。3.从句是由特殊疑问句转化而来，含有疑问意...
高考英语语法专题复习讲义 名词性从句
高中语法精讲 名词性从句。了解这样的从句前，我们先回忆下英语中常见的句子成分 主语谓语宾语表语定语状语补语同位语。再念叨一遍 理解英语中的句子成分对于长难句的理解是很有用的，阅读能力会进步飞快 那么问题来了 这些句子成分中，哪些可能是名词呢？换句话说，名词能做哪些成分呢？主语，宾语，表语和同位语是名...
英语语法 名词性从句
考研语法，在考研英语的复习中是基础，也是难点，英语名师杨凤芝主要从总体上分析了句式和结构，并详细讲解名次及名词性从句所包含的类型及用法，对各个知识点进行了详细阐释，并辅以经典例句。考研语法，在考研英语的复习中是基础，也是难点。千里之行，始于足下。为了把语法体系学好，我们首先要认识一下基本概念。一 句...