Ⅰ 求英语必修三 Unit4的短文翻译
地球上生命的起源
没有人确切知道地球是怎样开始形成的，因为在很早很早以前地球就形成了。然而，一种普遍为人们所接受的理论是；宇宙起源于一次大爆炸，这次大爆炸讲物质投射到四面八方。然后，原子形成并结合成恒星和其他天体。
大爆炸后好几十亿年过去了，但地球还只是一团尘埃。随后他会变成什么没人能知道，知道38-35亿年钱，这团尘埃才慢慢形成一个固体的球状物。地球开始变得激烈动荡，不知道这个固体形状是否会继续存在下去。它猛烈的爆炸喷出了烈火与岩石。最终产生了碳、氮气、水蒸气和其他多种气体，从而形成了地球的大气层。更为重要的是，地球冷却了下来，地球的表面就开始出现了水。
在火星这些其他行星上都出现了水，但和地球不同的是，遮羞水后来都消失了。水会对生命的发展起关键作用，这一点在当时并不明显。很多科学家相信，由于地球上长期有水存在，它使得地球得意把有害气体和酸性物质溶解在海洋里。这就产生了一系列的反应，使得生命就有可能发展下去。
好几百万年以后，水的表面开始出现了极小的植物。他们繁殖起来就使得早期的海洋充满了氧气，这为早期的贝类及其他各种鱼类的发育进一步创造条件。接着，绿色植物开始出现在陆地上。随后，陆地上出现了动物，其中有一些是昆虫，另外一些叫两栖动物，他们既能在陆上生活，也能在海里生存。后来，当植物长大成了森林的时候，爬行动物出现了。他们一般是通过孵蛋而繁衍后代的。再后来一些叫做恐龙的巨型动物出现了。它们也生蛋，在地球上生存了一亿四千多万年。然而，六千五百万年前，恐龙时代结束了。它们为什么会突然灭绝，至今仍然是个谜。恐龙的灭绝使得地球上的哺乳动物的产生变得可能。哺乳动物不同其他以往所有的动物，因为他们可以在体内生产出幼仔并给幼仔哺乳。
最后，大约260万年前，一些小巧聪明、长着手脚的动物出现了，它们散布在地球的各个地方。于是，他们接着成为了这个行星上最重要的动物。然而，他们对地球却不怎么在意。他们把过多的二氧化碳释放到大气层中，这使得地球上的热不能释放到太空中去。因此许多科学家相信地球可能会变得太热而不适合生物的生存。所以，在未来的数百万年中，生命可否在地球上延续取决于这个问题是否能得到解决。
——————————————————————————————————————————
这字敲得太累了。。。╮(╯▽╰)╭
Ⅱ 急！！高一英语必修三Unit4句型转换
1 lucky enough to 2to be studying 3 break up
Ⅲ 高中英语必修三，四有哪些语法，知识点
高中英语必修三，四有哪些语法，知识点
主要有虚拟语气，情态动词，非谓语，定语从句，名词性从句，状语从句，动词时态，强调句型，倒装句，倒装等。
Ⅳ 求高中英语必修三，unit4的重点句！！
However, according to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all directions.
What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the st settled into a solid globe.
The earth became so violent that it was not clear whether the shape would last or not.
They were in time to proce carbon, nitrogen, water vapor and other gases, which were to make the earth’s atmosphere.
What is even more important is that as the earth cooled down, water began to appear on its surface.
It was not immediately obvious that water was to be fundamental to the development of life. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.
Why they suddenly disappeared still remains a mystery.
They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.
So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.
这里很多句子都是涉及到名词性从句。
Ⅳ 人教版新课标高中英语必修三单词unit4
sorry , i can ';t help you for having no this book now
Ⅵ 英语必修三人教版unit4 learning about language28页1 2 3题的答案
l have to wear ---uniform when lm at ------school lts one of the school rules
Ⅶ 高一英语必修三必修四所有语法
高中英语主要是对 完成时 的扩展和各种从句（主语，谓语，宾语，定语，强调句，同位语）的进一步讲解，具体问题还是通过习题理解比较好
Ⅷ 高中英语必修3UNIT4 语法
主语从句
一、 名词性从句概述：
在句子中起名词作用的句子叫名词性从句(Noun Clauses）。名词性从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。
名词性从句的连词
连接词：that，if/whether(是否)，
连接代词：what, whatever, who, whoever, whom, whomever, whose, which, whichever
连接副词：when, where, how, why, whenever, wherever, however
二、主语从句的连词分三类
（1）从属连词引导的主语从句 （that whether if）
that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。That 引导主语从句通常用it 作形式主语。
例如：That you will win the medal seems unlikely.
That you are so indifferent bothers me.
That she survived the accident is a miracle.
whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不可以省。
注意：引导主语从句，不能用if不能在开头，只能用whether。
Whether we will hold a party in the open air tomorrow depends on the weather.
Whether she is coming or not doesn’t matter too much.
（2） 用连接代词引导的主语从句
在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分.
例如：What you need is more practice.
What I want to know is this.
Whatever we do is to serve the people.
注：whatever / whoever的功用
whatever, whoever在主语从句中不含疑问意义。它引导主语从句，并在从句中作主语、宾语、表语等。
whatever = anything that; whoever = anyone who。要注意和whatever, whoever引导的让步状语从句的区别。
如：
Whoever breaks the law should be punished. （主语从句）
（ ＝Anyone who breaks the law should be punished. ）
Whoever breaks the law, he should be punished. （让步状语从句）
（ ＝No matter who breaks the law, he should be punished. ）
（3）用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。)
例如:Where we should leave it is a problem.
When they will come hasn’t been made pubic.
三、it 作形式主语的主语从句
有时为了考虑句子平衡，通常在主语从句处使用形式主语it，而将真正的主语从句移至句末。这分四种情况：
(1) 对于以连词that引导的主语从句，通常用形式主语it替代主语从句：
<a> It is +名词+从句
It is a fact that… 事实是……
It is good news that … ……是好消息
It is a question that … ……是个问题
It is common knowledge that … ……是常识
类似的名词还有：a pity；a wonder；a good thing； no wonder； surprise等。
It is a mystery to me how it all happened.
It is common knowledge that the whale is not a fish.
It is no surprise that Bob should have won the game.
It’s a pity that you missed the film.
<b> It is +形容词+从句
It is necessary that … 有必要……
It is clear that … 很清楚……
It is likely that … 很可能……
It is important that … 重要的是……
类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.
It is doubtful whether she will be able to come.
It was really astonishing that he refused to talk to you.
It is essential that he should be here by the weekend.
It seems obvious that we can not go on like this.
It is necessary that you （should）master the computer.
It is important that a student learn English well.
It’s clear that they badly need help.
It is likely that a hurricane will arrive soon.
需要注意的是，这类主语从句中，谓语动词很多为“（should）＋动词原形”，即要用虚拟语气。
<c> It is +过去分词+从句
It is said that … 据说……
It is reported that … 据报道……
It has been proved that … 已证明……
It must be proved that… 必须指出……
类似的过去分词还有：known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc.
例如：It is thought that he is the best player.
It is estimated that the vase is 2000 years old.
It is used to be thought that a new star must be e to a collision between two stars.
It has not been made clear when the new road is to be opened to traffic.
It is said that he was killed in the earthquake.
<d> It seems不及物动词 （happened / appears / doesn’t’t matter / makes no difference / occurred …）that …主语从句不可提前
It seems that they will win the game.
It makes no difference whether he will attend the meeting or not.
It does not matter if I missed my train.
It happened that I saw him yesterday.
(2) 对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句：
Whether they would support us was a problem.
他们是否会支持我们还是一个问题。
It was a problem whether they would support us.
他们是否会支持我们还是一个问题。
It remains to be seen whether it will do us harm or good.
它对我们是利是害，还得看看再说。
(3) 对关系代词型what引导的主语从句，通常直接将主语从句放在句首。如：
What we need is money. 我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
有时也可将助用形式主语。如：
It is clear enough what he meant. 他是什么意思很清楚。
(4) 如果句子是疑问句，则必须用带形式主语it的结构：
Is it true that he is the girl’s father? 他是那女孩的父亲，是真的吗？
How is it that you are late again? 你怎么又迟到了？
四、连词that的省略问题
引导主语从句的连词that 有时可省，有时不能省，其原则是：若that引导的主语从句直接位于句首，则that不能省略；若that引导的主语从句位于句末，而在句首使用了形式主语it，则that可以省略：
That you didn’t go to the talk was a pity. 很遗憾你没去听报告。(that不可省)
It was a pity (that) you didn’t go to the talk. 很遗憾你没去听报告。(that可省)