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名词性从句复习注意：1.在名词性从句中，连接词的选择要根据从句的句意和上下文来确定。
2.当从句是陈述句时，通常使用连接词that（可省略，但在正式文体中建议保留）；当从句是疑问句时，通常使用whether/if（表示选择或疑问）或连接代词/副词（表示具体的疑问内容）。
3.在宾语从句中，当从句是特殊疑问句时，其语序要调整为陈述句语序。
4.同位语从句与定语从句的区别在于：同位语从句是对前面名词或代词的具体内容的阐述或解释，而定语从句则是对前面名词或代词的修饰和限定。
一、主语从句定义：在句子中充当主语成分的从句。
引导词：that, whether, if, who, whom, which, what, whose, how, when, where等。
使用原则：主语从句通常位于句首，用于描述句子的主要动作或状态的执行者或承受者。
它可以是陈述句、疑问句或祈使句（但祈使句作为主语从句的情况较少见）。
构成：主语从句通常由连接词that（可省略，但当从句中有疑问词或表示否定、强调等意义的词时，通常不省略）或whether/if（表示选择或疑问）引导，后面跟完整的句子结构。
例句：1.What he said made me think deeply.2.Whether he will come or not is still a mystery.3.How we can solve the problem is our main concern.4.That the earth moves around the sun is a well-known fact.5.Whoever breaks the law should be punished.练习题1._____ he said at the meeting surprised us all.A. WhatB. ThatC. HowD. Why2._____ you do, do it with all your heart.A. WhateverB. WheneverC. WhereverD. However3.It is _____ he often fails in exams that makes his parents worried.A. whatB. becauseC. thatD. why4._____ is known to all, the moon travels around the earth.A. AsB. WhichC. ThatD. What5._____ we should do next is still under discussion.A. WhatB. HowC. WhetherD. When答案：AAC（强调句结构）AA二、宾语从句定义：在句子中充当宾语成分的从句。
一．概念：名词性从句就相当于一个名词（因为名词可以充当主语，宾语和表语，所以名词性从句包含主语从句，宾语从句和表语从句和同位语从句）二．名词性从句主语从句That she is beautiful is a fact.主语从句系定表宾语从句We know that she is beautiful.主谓宾语从句表语从句 Our opinion is that she is beautiful.主系表语从句同位语从句The opinion that she is beautiful is a fact.主同位语从句系定表三．名词性从句的格式 1. that+陈述句=名词宾1.结构：主语 + 谓语2.语序：陈述句语序3.连接词 :①由that 引导②由if /whether 引导know if / whether Hua likes fish.③由特殊疑问词引导，表示特殊疑问意义 I want to know what time it is now.4.时态①当主句是一般现在时，从句根据情况使用任何时态。
（即：主现从不限）I don’t know (that) she is singing now.②当主句是一般过去时，从句应使用过去某时态(一般过去时,过去进行时，过去将来时，过去完成时)。
He said (that) he was at home. 他说他在家里。
③主句使用一般过去时，但从句表示的是客观真理、自然现象时、从句仍用一般现在时。
The teacher told us light travels faster than sound.一、一般结构：主语+连系动词+表语从句，二、可以接表语从句的词有：①be(being, been, am ,is, are, was, were)（be动词）② feel,look,sound, taste, smell (感官动词）③ stand, lie,remain, keep, stay(保持动词）④bee, get, grow, turn ,go ,prove(变化动词）⑤ seem, appear(表象动词)三、公式：a.由连接词that（无意义）, whether（是否）引导的表语从句这时主句的主语常常是抽象名词，如problem, result, chance, suggestion, question, reason 等，表语从句对主句主语进行说明，解释等。
第十一讲名词性从句一般来说，名词在句中主要充当4种成分：主语、宾语、表语和同位语，于是便有了常说的4种名词性从句：主语从句、宾语从句、表语从句和同位语从句。
相当于名词作用的句子有3类：陈述句、一般疑问句和特殊疑问句。
因此，名词性从句可简单概括为这样一句话：名词性从句就是用3种句子分别充当另外一个句子的4种句子成分。
这便构成了名词性从句的本质特征。
1.that(1)that引导主语从句时，在从句中不作任何成分，也没有词汇意义，但一般不可省略。
That the earth goes around the sun is known to us all.众所周知，地球围着太阳转。
(2)that引导主语从句时可用it作形式主语，that不可省略。
常见句式主要有以下几种：①It＋be＋形容词(necessary, right, likely, unlikely, wrong, important, certain, clear, obvious, strange, normal等)＋that从句It isn’t likely that I should accept such an offer as that.我不可能接受像那样的帮助。
②It＋be＋名词(短语)(a pity, a shame, good news, a fact, an honour, a wonder, no wonder等)＋that从句It’s no wonder that he didn’t want to go.难怪他不想去。
③It＋be＋过去分词(said, told, heard, reported, decided, suggested, advised, ordered, remembered, thought, considered, wellknown, announced等)＋that从句It is decided that the meeting has been put off until next Monday.会议被推迟到下周一已经定下来了。
[名师指津]在“It＋be＋suggested/advised/ordered/requested/insisted/required ...＋that从句”结构中，从句谓语应用“(should＋)动词原形”。
It is suggested that you (should) spend more time in studying English.建议你花更多的时间学习英语。
④It＋特殊动词或短语(seem, appear, happen, matter, turn out, occur to, make no difference等)＋that从句It suddenly occurred to her that Joe was afraid of being alone.她突然想到乔害怕独自一个人待着。
2．whether/if引导的主语从句主语从句位于主句谓语动作前，表示“是否”，只能用whether。
若用it作形式主语，则whether与if可互换。
Whether we can have clean drinking water lies in what effective measures will be taken by the government about water pollution.我们能否有干净的饮用水依赖于政府将采取什么样的有效措施处理水污染问题。
It’s uncertain whether/if he’ll come this evening.他今天晚上是否会来还不确定。
3．wh类连接词引导的主语从句wh类连接词包括连接代词(who, whom, whose, what, whoever, whomever, whatever 等)和连接副词(when, where, why, how, whenever, wherever, however等)。
What Barbara Jones offers to her fans is honesty and happiness.芭芭拉·琼斯展现给她的粉丝们的是诚实和快乐。
[对点练1] 用适当的连接词填空①How we understand things has a lot to do with what we feel.②It doesn’t matter whether you turn right or left at the crossing —both roads lead to the park.③It’s no wonder that you’ve achieved so much success.④It has not been decided yet who will take charge of the factory when the boss is away.⑤Whoever sets fire to the forest should be punished.1.thatthat引导宾语从句时无词义，在从句中不作成分，口语中一般可以省略，但下列情况下不能省略：(1)当that从句作介词的宾语时。
I don’t know exactly where he lives, except that it’s somewhere out in the wilds.他住在哪里我不很清楚，只知道是远离城市的荒野之中。
(2)动词后跟有多个that引导的宾语从句时，只有第一个that可以省略，从第二个从句开始that不可省略。
He told me (that) he had to leave and that he would be back soon.他告诉我他得离开并且很快就会回来。
(3)宾语从句前有插入语时。
We hope, on the contrary, that he will stay at home with us.恰恰相反，我们希望他和我们待在家里。
(4)it作形式宾语的宾语从句。
①一些动词后的宾语从句有宾语补足语时，则需要用it作形式宾语，而将that引导的宾语从句后置。
常见的这类动词有find, think, consider, believe, guess, suppose, make 等。
He has made it clear that the meeting will not be postponed.他清楚地表明会议不会被推迟。
②hate, like, dislike, appreciate, enjoy等表示“喜欢”、“厌恶”的动词以及一些动词短语see to, depend on, rely on等常用it作形式宾语，而将宾语从句后置。
I shall see to it that he is taken good care of when you are absent.你不在的时候，我负责把他照顾好。
2．whether与if引导的宾语从句whether与if引导宾语从句时，在从句中不作任何成分，但有具体的含义，意为“是否”。
在下列情况下只能用whether而不能用if：(1)宾语从句中有or not时，只能用whether。
I don’t know whether or not the report is true.＝I don’t know whether the report is true or not.我不知道这个报道是否是真的。
(2)介词后的宾语从句要用whether，whether可与不定式连用。
It depends on whether we have enough time.这取决于我们是否有充足的时间。
They don’t know whether to go there.他们不知道是否去那里。
3．连接代词和连接副词引导的宾语从句连接代词和连接副词引导宾语从句时既充当句子成分又有具体词义，且不可省略。
Our teachers always tell us to believe in what we do and who we are if we want to succeed.我们的老师总是告诉我们，如果想成功的话，就要相信我们所做的事以及我们自己。
[对点练2] 用适当的连接词填空①The companies are working together to create what they hope will be the best means of transport in the 21st century.②As many as five courses are provided, and you are free to choose whichever suits you best.③Jerry did not regret giving the comment but felt that he could have expressed it differently.④Only you can decide which one suits you best.⑤None of us knows where these new parts can be bought.1.在句中作表语的从句称为表语从句。
表语从句位于系动词之后，引导词有三类：从属连词只起连接作用，其中if不能引导表语从句，that一般不能省略；连接代词在从句中作主语、宾语、表语或定语；连接副词在从句中作状语。
I’d like to start my own business — that’s what I’d do if I had the money.我愿意自己创业——那就是如果我有钱将会做的事情。
The problem is whether the air pollution can be controlled.问题是空气污染能否被控制住。
2．其他连接词引导的表语从句(1)as if/though 引导的表语从句，有时可用虚拟语气。
The thick smog covered the whole city. It was as if/ though a great black blanket had been thrown over it.厚重的烟雾覆盖着整座城市，好像一个厚厚的黑色毯子扔到它的上面。
(2)because, why 引导的表语从句。
⎩⎪⎨⎪⎧ This/That is why ...这/那是……的原因This/That is because ...这/那是因为……He failed. That is because he didn ’t work hard.他失败了。
