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句子是表达思想感情的最小的语言单位，一篇文章是由无数个句子组成的。句子的优劣会直接影响整篇文章的质量。那么，如何才能写好一个英文句子呢？首先你写的句子要能符合下列基本要求，否则就不是一个好句子。
一、内容一致
一个英语句子只能反映一个中心意思，这就是写一个英语句子的目的所在，句子中的所有内容都是为这个目的服务的，都是围绕句子的中心意思进行的，这就是所说的内容一致。例如：
From seeing the work habits of North American students,foreign students get the impression that all North Americans are always very busy.
这个句子的中心意思是all North Americans are always very busy。句子中的其他内容是用来说明为什么外国学生会得出这样的印象的。请再看个句子：
He always went to bed late at night,so he got very good results in his studies.
该句中前后两个部分似乎没有必然的逻辑联系，即使每天晚睡觉，但如果不努力学习，成绩不大可能会好的。该句内容不一致，没有说明同一个中心意思。可改成：
He worked very hard at his lessons and always went to bed late at night,so he got very good results in his studies.
这个句子内容一致，都是说明他学习成绩好的原因。再如：
July is the hottest season and December is the coldest.
这个句子意思不完整，因为它没有指明具体在什么地方，七月最热，十二月最冷。可改成：
In this region July is the hottest season and December is the coldest.
这个句子意思完整，内容反映的都是该地区的天气情况。又如：
This summer vacation the teachers are going to Beijing.They are staying there for a week.They are going to tour the Great Wall there.
一个能够表达一个完整意思的句子被切成几个短句，句子内容的一致性被破坏。故上句应改成：
This summer vacation the teachers are going tO Beijing,where they will stay for a week and during their staying there,they are going to tour the Great Wall.
二、意思连贯
意思连贯指句子各部分之间的意思清楚，衔接合理，过渡自然。例如：
Three passions,simple but overwhelmingly strong,have governed my life:the longing for love,the search for knowledge and unbearable pity for the suffering of mankind.
这个句子的意思一层紧扣一层，层层深入，衔接紧密，连贯自然。
造成句子意思不连贯的原因很多，如平行结构错误，代词指代不清，悬垂修饰语，误置修饰语，不适当地变换人称、语态等。例如：
She is sympathetic by nature and who is always ready to help others.
该句结构不平行，句子的意思不连贯。应改成：
She is sympathetic by nature and always ready to help others.或改成：
She is a sympathetic woman who is always ready to help others.再如：
He was knocked down by a bicycle,but it was not serious.
在第二个分句中，主语被变更，整个句子意思不清楚，不连贯。应把句子改成：
He was knocked down by a bicycle,but was not badly hurt.
被改正的句子中后一个分句的主语没有被变更，这样句子要表达的意思连贯紧密、一气呵成。
三、清楚自然
英语句子应该写得清楚自然，这是因为语言表达的目的是为了交际，只有表达清楚自然的句子才能收到好的交际效果。
一个英语句子意思表达得是否清楚自然与多种因素有关，如修饰语的位置，代词指代的内容，语态、人称等的变换，模糊比较等。例如：
The girl who had sat down quickly opened her book.
该句中，修饰语quickly的位置造成句子意思含糊不清。应调整该修饰语的位置为：
The girl who had quickly sat down opened her book.
The girl who had sat down opened her book quickly.
这两个句子意思清楚自然，无歧义。再如：
He ooened the window forcefully and the glass was broken.
该句两个分句中的主语不是同一个，第二个分句的意思含糊不清，句子结构也不自然。玻璃怎么打坏的，谁打坏的，都不大清楚。应取消第二个分句中的被动语态，不要变更主语：
He opened the window forcefully and broke its glass.
这是一个简单句，opened和broke的两个动作都是由主语发出的，句子意思清楚，结构自然。又如：
John loves his daughter more than his wife.
这个句子意思模糊不清的原因是由比较级造成的。其实该句子表达了以下两种意思：
John loves his daughter more than his wife does(loves his daughter).
John loves his daughter more than he loves his wife.
四、精炼简洁
一个好的英语句子也应该精炼简洁，意思表达言简意赅。句子中不必要的词应该去掉，能省去的词要省去。例如：
These similarities made them become close friends.
这个句子中的become是多余的。句子应改成：
These similarities made them close friends.
这个句子虽然只少了一个词，但显得简洁自然多了。
精炼简洁的句子还包括能用简炼的表达法，摒弃啰嗦冗长的表达方法。例如：
My grandmother is a woman who talks a great deal.
这是一个含关系分句的复合句，其实它完全可以用一个简单句来表达：
My grandmother is talkative.
无疑，这个句子比原句要简洁得多，但所表达的意思，传达的信息与原句是完全一样的。再如：
What motivated him to apply for admission to this prestigious university is to seek an education of good quality.
这个句子显得有些冗长，表达不简洁，其实句中的主语分句an education of good quality可以用名词a good education表达，整个句子可改成：
His motive for applying to this prestigious university is to seek a good education.
原句中两处较繁琐的表达方式都被较简洁的表达方式所代替，句子简洁，意思清楚。
五、强调有力
句子中如果有重要的意思，该重要的意思应获得强调，使句子表达更有力。强调一个英语句子或句子中的某个成分可以用修辞手段也可以用语法手段。所谓修辞手段指选择某种语序、某种句式、某种结构等使句子或句子某个部分达到强调的目的，修辞强调是选择性的、相对性的。语法强调手段指用某些特定的表达方式来达到强调句子或句子中某个成分的目的，这种强调手段是强制性的、绝对的。例如：
It was several days ago that we met the scientist in the street.
这个句子是语法强调句，It is(was)...that...这种结构是固定的，强调是强制性的。再如：
Into the room came a stranger.
在这个句子中into the room成了有标记主位，该状语获得强调，主语a stranger被置于句末，成为信息核心，也获得了强调，但这种强调是选择性的，它没有固定的形式，所以该强调句是修辞强调句。又如：
Under no circumstances will China promise to do such a thing.
这是一个语法强调句，介词短语中含否定词且置于句首，句子必须部分倒装。它是强制性的，不是选择性的，故这种强调是语法强调。
六、音调和谐
一个英语句子不但要意思清楚连贯，强调有力，而且应该听起来悦耳，富有感情色彩。音调和谐的句子声情并茂，修辞效果显而易见。英语中的对偶句、平行结构、押头韵等常常可以使句子音调和谐，悦耳动听。例如：
If there is an irresistible force,there can be no immovable object.If there is an immovable object,there can be no irresistible.
这两句是对偶句，句子结构对称，富有诗意，读起来琅琅上口，irresistible和immovable对照、对立，音调和谐。再如：
We met in the classroom,in the bedroom and in the reading-room.
该句中三个介词短语结构平行，读起来节奏感很强，音调十分优美。又如：
She sells seashells on the seashore.
该句中几个实义词都是“s”开始的，押了头韵，音调和谐，美不胜收。
七、形式多样
在同一篇文章中，如果每个句子的形式都一样，结构都是相同的，那么即使文章的内容再好，读起来也会令人乏味。只有句子形式多样，才能使英语文章变得有声有色，锦上添花。
句子的多样性包括长短句的交替使用，简单句、复合句的交替使用等等。例如：
In the long history of the world,only a few generations have been granted the role of defending freedom in its hour of maximum danger.I don't shrink from this responsibility;I welcome it.I do not believe that any of us would exchange places with any other people or any other generation.The energy,the faith,the devotion which we bring to this endeavor will light our country and all who serve it,and the glow from that fire can truly light the world.
—John F.Kennedy:The Inaugural Address
这段文字引自肯尼迪的就职演说，长短句、复合句和简单句交替使用，语言生动自然，很有感召力。
句式的多样化还包括句子开头的多样性。一般情况下，名词或代词作主语出现在主位上，但也可以有其他词或词组出现在主位上作为句子的开头。
1.分词或分词短语。
Thinking of what might happen,he stayed in the classroom.
2.形容词或形容词短语。
Intelligent and hard working,the girl passed the examination.
3.介词短语。
In front of the classroom there is a flowerbed.
4.不定式短语。
To serve the people better,we should study about my background.
5.状语分句。
Because she was awarded a scholarship,she was able to continue her study.
6.名词分句。
What he said surprised everyone present.
八、句子合并
常常用短句和主语开头的句子会使文章单调乏味，句子合并是一种克服此类弊端的有效方法。我们可以用各种方法把相关的短句合并成较长的句子。
1.通过用形容词、副词或介词短语把相关的短句合并成长句。
The building is new and magnificent.
The building is situated on the main street of the city.
The building makes a grand picture.
这三个短句可合并成：
The new and magnificent building on the main street of the city makes a grand picture.
2.用分词短语把相关短句合并起来。
The thief was caught on the spot.
The thief was brought to the police station.
这两个短句可合并成：
Caught on the spot,the thief was brought to the police station.
3.用同位语或同位短语把相关短句合并起来。
Jane Austin wrote six novels in all.
Jane Austin was one of the leading novelists in the 19th century England.
这两个句子可合并成：
Jane Austin,one of the leading novelists in the 19th century England,wrote six novels in all.
4.用复合主语或谓语把相关句子合并起来。
We watched the basketball match on TV that night.
We went to bed late that night.
这两个句子可合并成：
That night we watched the basketball match On TV and went to bed late.
5.用复合句把相关短句合并起来。
The man is our English teacher.
The man has taught for abont thirty years.
这两个短句可合并成：
The man who has taught for about thirty yearn is our English teacher.