Unit4SectionⅢGrammar——主语从句

1、1.以上各句皆为主从复后自主感悟Section Grammar 主语从句 语 境 自 主 领 悟先观察原句What it was to becomewas uncertain until between4.5 and 3.8 billion years ago when the dust settled into a 合句，句中黑体部分为名solid globe.词性从句作主语，称之为The earth became so violent that it was notclear主语从句。whether the shape would last or not.2what 引导主语从句，What

2、 is even more importantis that as the earthwhat 在从句中作表语 (句cooled down， water began to appear on its surface. )，主语 (句 )，及宾语It was not immediately obvious that water was to be(句 )。fundamental to the development of life.What many scientists believeis that the continued presence of water allowed the ear

3、th to dissolve harmful gases and acids into the oceans and seas.So whether life will continue on the earth formillions of years to comewilldependon whetherthis problem can be solved. 语 法 精 要 点 拨一、主语从句的基本用法1主语从句的引导词3whether 引导主语从句，意为：是否 (句 )。4可用 it 作形式主语，真正的主语为名词性从句 (句由 that 引导主语从句 )。类别例词说明两者在从句中均不作成

4、分，只起从属连词that，whether连接作用； that 无实义， whether表示“是否”。连接代词who，what，which， whoever， 在从句中作主语、宾语、表语、whatever 等定语等成分。连接副词when, where， how，why 等在从句中作时间、地点、方式、原因状语等成分。That you are coming to Londonis the best news I have heard this long time.你将来伦敦是好久以来我听到的最好的消息。Whether it will do us harm remains to be seen.它是否

5、对我们有害还要看一看。第 1页WhatI have seen todayhas made a very deep impression on me.今天我的所见所闻给我留下了非常深刻的印象。Whoever breaks this lawdeserves a fine.触犯本法者应予以罚款。Whichever(of you)comes in firstwill receive a prize.(你们中 )谁先进来谁得奖。When we will have a meetingis an important question.我们何时举行一次会议是个重要的问题。Where we shall do t

6、he testis still under discussion.我们在什么地方做这个实验还在讨论。 名师点津 主语从句中连接词的选择技巧(1)根据连接词在从句中所作的语法成分。(2)根据连接词在从句中的意义。即时训练 1用 whether，that，whoever 填空 That she became an artist may have been due to her fathers influence. Whether we will hold a party in the open air tomorrow depends on theweather. Every year，whoev

7、er makes the most beautiful kite will win a prize in the Kite Festival.2it 作形式主语为保持句子平衡，常把主语从句后置，而用形式主语it 代替。 it 作形式主语时常用于以下句型：句型说明It 系动词形容词主常用于此句型的形容词有important，(un)likely ，语从句possible，necessary，natural，wrong 等。It 系动词名词主语常用于此句型的名词有fact ， idea， honour，从句question，pity 等。第 2页It 系动词过去分词常用于此句型的过去分词，有kno

8、wn ，proved，主语从句said， decided，suggested， thought 等。It 不及物动词主语从常用于此句型的动词有 appear，happen，seem，句occur， matter 等。Its possible thathe has been to Beijing.他有可能去过北京。Its a pity that you didnt attend the meeting.你没参加这次会议太可惜了。It seems thatit is going to rain.看起来好像要下雨。It is important that he should know about t

9、his.他应该知道此事是重要的。It is suggested thathe meeting be put off.有人建议会议延期召开。 名师点津 在 “ It be过去分词主语从句” 结构中 ，过去分词若为suggested/ordered/required/advised等，主语从句中的谓语用 “(should)do”。 在 “It be 形容 词 主语 从句 ” 结 构中，若形容词为 important/necessary/strange等，主语从句中的谓语用 “(should)do”。即时训练 2完成句子很可惜你不能来参加我的生日聚会。Its a pity that you cant

10、 attend my birthday party【.导学号： 65162028】有人建议这位老人到乡村休息一下。Its suggested that the old man should go to the countryside to have a rest.在我看来你好像不赞成这个计划。It seems to me that you disagree with the plan.二、主语从句中应注意的问题1从句要用陈述语序第 3页How he succeededis still a puzzle.他是如何成功的仍然是个谜。2主谓一致(1)从句作主语时，主句的谓语一般用单数形式。Where

11、 he will get a job after graduationhas puzzledhim much.毕业后到哪儿找一份工作使他很困惑。 名师点津 what 引导主语从句时 ，有时主句谓语动词应与主句中作表语的名词保持一致。What the school needs mostare books.这所学校最需要的是书。(2)如果由 and 连接两个或两个以上的主语从句作主语时，谓语动词用复数；由两个或多个连接词引导一个主语从句时，谓语动词用单数。When they will start and where they will go havenot been decided yet.他们将

12、在什么时候动身以及要去哪里还没定下来。When and where they will hold the meeting isnot clear.他们何时何地召开会议还不清楚。即时训练 3单句改错When will we set off is still under discussion.will we we willWhat he needs most are money.are isWhen and where the meeting will be held have not been decided. havehas That the coal workers are still al

13、ive are a wonder第.二个 areis 语 法 应 用 落 实.单句语法填空1It is often the case that anything is possible for those who hang on to hope.2Your support is important to our work.Whatever you can do helps.3Where Li Bai ，a great Chinese poet，was born is known to the public，but some第 4页wont accept it.4How we understan

14、d things has a lot to do with what we feel.5Exactly when the potato was introduced into Europe is uncertain，but it was probably around 1565.6When the delayed flight will take off depends much on the weather.7I think what impresses me about his painting is the colours he uses.8Some people believe wha

15、t has happened before or is happening now will repeat itself in the future.9What makes the book so extraordinary is the creative imagination of thewriter.10 What you said at the meeting describes a bright future for the company.完成句子1有人命令操场建设下周完成。It is ordered that the construction of the sports grou

16、nd should be completed nextweek2他在这次活动中将粉演什么角色还未定下来。What role he will play in this activity hasnt been decided.3现在她正在买的东西是一些杂志。What she is buying now are some magazines.4很明显刚刚有人来拜访过他。It is clear that somebody came to visit him just now.5这个地区的争执 (dispute)何时结束让很多人困惑。 When the dispute in this area will stop puzzles many people.6遗憾的是小男孩为了帮父亲养家只好辍学。It is a p