第二节：句子分类

按使用目的分类：
    一、陈述句 （五种基本句型）
英语常用的最基本句式有五种，这里，S＝主语；V＝谓语；P＝表语；O＝宾语；O1＝间接宾语；O2＝直接宾语；C＝宾语补足语

    1．Subject (主语) ＋ Verb (谓语)
    这种句型中的动词大多是不及物动词，这些动词常见的有：appear, apologize, arrive, come, die, disappear, exist, fall, happen, rise,等等。
    He runs quickly． 他跑的很快。
    They listened carefully．他们听的很仔细。
    He suffered from cold and hunger．他又冷又饿。
    China belongs to the Third World．中国属于第三世界国家。
    The students work very hard. 学生们学习很努力。
    She apologized to me again. 她再次向我道歉。
    The accident happened yesterday evening.事故是昨天晚上发生的。

    2．Subject (主语) ＋ Link. V(系动词) ＋ Predicate(表语)
    这种句型中的系动词一般可分为下列两类：
    （1）表示状态的系动词。这些词有：be（am\is\are）, look, seem, appear, smell, taste, sound, sit, stand, keep, remain, continue, stay,等等。如：
    She is a nurse. 她是个护士。
He is older than he looks．他比看起来要老。
He seems interested in the book． 他似乎对这本书有兴趣。
    The story sounds interesting． 这个故事听起来很有趣。
    The desk feels hard．  桌子很结实。
    The cake tastes nice． 蛋糕味道很棒。
    The flowers smell sweet and nice．花闻起来很甜美。
    We should remain modest and prudent any time.我们在任何时候都应该保持谦虚谨慎。
    This kind of food tastes terrible.这种食物吃起来很糟糕。
The picture looks more beautiful at a certain distance.这幅画在一定的距离看更漂亮一些。
(2) 表示转变或结果的系动词。这些词有：become, get, grow, turn, go, come, prove,等等。
You have grown taller than before．他比以前高了许多。
    He will become a teacher when he grows up．长大后，他想成为一名教师。
    He could never turn traitor to his country．他永远不会背叛他的国家。
    Spring comes. It is getting warmer and warmer.春天到了，天气变得越来越暖和。
    Don't have the food. It has gone bad.不要吃那种食物，已经变质了。
    The facts prove true.事实证明是正确的。

    3. Subject(主语) ＋ Verb (谓语) ＋ Object (宾语)
    这种句型中的动词应为及物动词或者可以后接宾语的动词短语。同时，句子中有时含有与宾语有关的状语。作宾语的成分常是：名词、代词、动词不定式、动名词或从句。
    I saw a film yesterday． 我昨天看了部电影。
    Have you read the story? 你读过这个故事吗？
    You can put the books in your bag.你可以把书放在书包里。
    Farmers in our area grow lots of vegetables.我们这里的农民种很多种蔬菜。
    She lost the chance to make her appearance on the stage.她失去了在舞台上露面的机会。
    I prefer to make web pages.我更喜欢做网页。

    4. Subject(主语)＋Verb(谓语)＋ Indirect object(间接宾语)＋Direct object (直接宾语)
    这种句型中作间接宾语的常常指“人”，直接宾语常常指“物”。常常称为“双宾语”
    He gave me a book. = He gave a book to me．
    He brought me a pen. = He brought a pen to me．
    He offered me his seat. = he offered his seat to me．
    注意下边动词改写后介词的变化：
    Mother bought me a book. = Mother bought a book for me.
    He got me a chair. = He got a chair for me．
    Please do me a favor. = Please do a favor for me．
    He asked me a question. = He asked a question of me．
Yesterday her father bought her a bicycle as a birthday present.
昨天她父亲给她买了一辆自行车作为生日礼物。
    The old man is telling the children stories in the Long March.老人正在给孩子们讲长征中的故事。
    其实，要想区分出来Indirect object(间接宾语)和Direct object (直接宾语)非常简单。关键就是看谓语动词。谓语动词后面既然有两个宾语，那么我们就看哪一个宾语和谓语动词的联系更加紧密。直接由动词动作作用的那个就是直接宾语，作用不是很紧密的那个就是间接宾语。
    拿上面一个例子来看：Her father bought her a bicycle. 这句话里面，她爸爸给她买了辆自行车，谓语动词是“买”，后面的两个宾语分别是“她”和“自行车”。所以买的直接对象就是“自行车”，只不过是把自行车买给她而已。The old man is telling the children stories.在这句话中，老人正在给孩子们讲故事，谓语动词是“is telling”,那么讲的最直接的对象一定是故事，只不过是把故事讲给孩子们听而已。所以“故事”是直接宾语，“孩子们”是间接宾语。

    5．Subject(主语)＋Verb (动词)＋Object (宾语)＋Complement(补语)
    这种句型中的宾语 ＋ 补语可统称为“复合宾语”。担任补语的常常是名词、形容词、副词、介词短语、分词、动词不定式等。
    They made the girl angry．    
    They found her happy that day．
    I found him out．
    I saw him in．
    They elected him captain.
    He painted the wall white. 他把墙漆成白色。
    We found him an honest person.我们发现他是一个诚实的人。
    His mother told him not to play on the street.他母亲告诉他不要在街上玩。
    注意：有些动词后面所接的动词不定式作宾补时，不带to。概括一下就是：五看三使两听一感觉
    五看：look at、see、watch、notice、observe
    三使：have、make、let
    两听：listen to 、hear
    一感觉：feel
    The boss made him do the work all day.老板让他整天做那项工作。

【Example 1】
  I have heard both teachers and students   D   well of him.
   A. to speak   B. spoken   C. to have spoken   D. speak
  [解析]：题目中有have, 后面是不定式作宾补。所以省略to
【Example 2】
   The engines are made  A   at full speed.
A. to work   B. work   C. working     D. to be worked
题目表示的是被动语态。尽管有“五看三使两听一感觉”中的词，仍然要加上to
    6．在以上的五种基本句型中，Subject(主语)＋Verb(谓语)＋ Indirect object(间接宾语)＋Direct object (直接宾语) 和Subject(主语)＋Verb (动词)＋Object (宾语)＋Complement(补语) 分别称为双宾语和复合宾语。都是动词后面带有“两个宾语”。要区分这两种基本句型非常简单。只要在动词后面的两个宾语中间加上个“是”，如果逻辑成立，即复合宾语，就是Subject(主语)＋Verb (动词)＋Object (宾语)＋Complement(补语)；如果逻辑不成立，即双宾语，就是Subject(主语)＋Verb(谓语)＋ Indirect object(间接宾语)＋Direct object (直接宾语)
    Mother bought me a book.
    这句话中，在后面两个宾语中间加上“是”，构成：“me”是“a book”. 我是一本书，很显然逻辑是错误的。因此这句话是双宾语。属于Subject＋Verb＋ Indirect object＋Direct object结构。
    We found him an honest person.
    这句话中，在后面两个宾语中间加上“是”，构成：“him”是“an honest person”.他是个诚实的人。逻辑正确。因此是复合宾语。属于. Subject＋Verb ＋Object ＋Complement结构。
    7．除了基本句型的成分不变外，通常是在这些成分的前面或后面增加一些修饰语而加以扩大。这些修饰语可以是单词（主要是形容词、副词和数词），也可以是各种类型的短语（主要是介词短语、不定式短语和分词短语）。下面以基本句型五（v+o+o.c）为例：
    We found the hall full. 我们发现礼堂坐满了。
    We found the great hall full of students and teachers. 我们发现大礼堂坐满了学生和教师。
    We found the great hall full of students and teachers listening to an important report.
    我们发现大礼堂坐满了学生和教师，在听一个重要报告。
    We found the great hall full of students and teachers listening to an important report made by a comrade from the People's Daily on current affairs in East Europe.
我们发现大礼堂坐满了学生和教师，在听人民日报的一位同志作有关东欧局势的重要报告。

    二、疑问句
    1． 一般疑问句 General Questions. 是将助动词、情态动词和系动词be置于主语前面。并用yes/no来回答。
    Is he in the reading-room? –Yes, he is./No, he isn’t. 他在阅览室吗？--是的，他在/不，他不在。
Is this train leaving for London? –Sorry, I have no idea./ I’m afraid not.
这班火车开往伦敦吗？--对不起，我不知道。/恐怕不。
    Are there any pictures in your room? 你房间里面有画吗？
    Have you any difficulties with your study? 你学习上又困难吗？
    如果have 不作为“有”的意思，而作为行为动词。疑问句要用助动词do.
    Do you have supper at 6? 你六点吃晚饭吗？
    但是在许多美国英语中，即使have作为“有”的意思，疑问句也用了助动词do.
    Do you have any idea? 你有意见吗？
    Does she have blue eyes? 她是蓝眼睛吗？
    Must I return the book today? –Yes, you must. 我必须今天还上这本书吗？是的你必须还。
    Dear you go out without your parents’ permission? 未得到父母的允许你敢出去吗？
    Can you swim across the river? 你能游过这条河吗？
    2．特殊疑问句 Special Questions. 由疑问代词what, which, who, whom, whose和疑问词how, when, where, why来引导。这些疑问词不仅引导特殊疑问句，而且在句中充当一定的句子成分。
    Who is in charge of the work?谁对这项工作负责？（主语）
    Whose won the third prize? 谁的（作品）获得三等奖？（主语）
    What would you like for breakfast, Mr. Scott? 斯科特先生，早饭想吃点什么？（宾语）
    Which is my seat? 哪是我的座位？（表语）
    Which room do you live in? 你住哪一个房间？（宾语的定语）
    Whose pen is this？这是谁的钢笔？（表语的定语）
    How many students are there in your class? 你们班有多少学生？（how many作主语定语）
    疑问副词在引导特殊疑问句，并在句中作状语。
    How did you enjoy your Christmas? 你如何过圣诞节？
    Where have you put my book? 你把我书放哪了？
    Why should you be so interested in my affairs? 你为什么对我的事情如此感兴趣？
    3．附加疑问句 Tag-questions（又称反意疑问句）
    主要由“陈述句+疑问句”构成。可以要求对方证实所述的情况或看法。通常这两部分是反意的。陈述部分是肯定，后面的附加问句就是否定。陈述部分是否定，后面附加部分是肯定。
陈述部分的主语是I，疑问部分要用 aren't I。
I'm as tall as your sister, aren't I? 我跟你姐一样高，对吗？
陈述部分的谓语是wish，疑问部分要用may +主语。例如：
I wish to have a word with you, may I? 我想与你说句话，行吗？
    四、祈使句
    祈使句The Imperative Sentence,即动词原形为首，用来表示命令、请求、要求、劝告、忠告、叮嘱、警告、建议、号召、指示、邀请、允许、禁止、祝愿、诅咒等。
    Fire! 开火！  Shut the door, please. 请把门关上。Don’t talk any more. 别说话了。
    Let’s have a meeting to discuss it. 我们开个会讨论一下吧。
    Take an aspirin for your headache. 吃片阿司匹林治你头疼。
    五、感叹句
    感叹句 The Exclamatory Sentence, 主要用来表示说话人的惊异、喜悦、赞赏、气愤、遗憾等情绪。通常用how或者what来引导。how放于what句首，主语、谓语用正常语序位于其后，句末用感叹号。
    副词how修饰形容词、副词或动词。
    How careless he is! 他多么粗心啊！
    How foolish you must have thought I was! 你一定认为我多么傻啊！
    代词what修饰名词。
    What fine weather we have today! 今天天气多好啊！
    What nonsense you talk! 你胡说什么！
    What strange ideas you have! 你的想法真怪！

按结构分类

    一、简单句 The simple sentence
    包括一个主谓结构的句子。有时一个句子虽然有两个或者两个以上的主语或者谓语，仍然是简单句。
    Spring is the best season for planting trees. 春天是植树的最佳季节。
    Sugar, starches, fats and proteins are foods. 糖、淀粉、脂肪和蛋白质都是食物。
    Heat, light, electricity and sound are different forms of energy and can be converted form one form into another. 热、光、电和声是不同形式的能且相互间可以从一种形式转化承另一种形式。
    二、并列句
    如果一篇文章所有的句子都是五种基本句式，就表达不了上下文的逻辑关系，句子与句子之间的联系也显得异常松散。我们也注意到，英语文章中的句子都很长，靠的就是用连词把前后句子组成较长的并列句（Compound Sentences）和复合句（Complex Sentences）。
    这种句子是由并列连词and, but, yet, for, as well as, either …or, both … and, neither … nor, not only … but also, whether … or, so等等把简单句连接起来组成的，用来表达并联、选择、转折、否定、递进等关系。如果前后的句子是先后关系或者并列关系，可以在任何句子之间加上连词。
    I enjoy music and he is fond of playing guitar.  
    The two words spelled differently, but pronounced the same.
    Not only the fur coat is soft, but it is also warm.
    当我们要表达的两个观点不一致时，就可以使用表达转折意义的连词。
    The car was quite old, yet it was in excellent condition.
    The coat was thin, but it was warm.
    当我们要表达先后或因果关系时，就可以使用表达因果关系顺序的连词。
    The snow began to fall, so we went home.
    He sold his farm, so he had enough money for his journey.
    三、复合句
    1．主语从句
    主语从句在句子中担当主语成分。
    What you are doing seems very difficult.
   = It seems very difficult what you are doing.
    Whether he will come or not is unknown.
   = It is unknown whether he will come or not.
    Whoever will be married to Tom is none of our business.
   = It is none of our business whoever will be married to Tom.
    2．宾语从句
    宾语从句在句子中担当宾语成分，是英语中使用量最大的从句之一。
    My major professor stated that science courses required a laboratory period. 
    We don’t know which method is much better to English teaching.
    Students want to know how these interesting phenomena happen.
    3．表语从句
    在“主语 + 系动词 + 表语”结构中，当表语由句子来充当时，这个充当表语的句子就是表语从句了。
    When this railway station is to be finished is what people are popularly concerned about.
    The first reason is that some people don’t know how to say “No”.   
    My problem is whether they will discuss the question at the meeting or behind closed doors.
    Our concern is who will be elected the next president of the association.
    4．同位语从句
同位语从句是比较难以掌握的名词性从句，关键是要搞清楚这个从句和它前面的名词（如idea, suggestion, fact, news, opinion, evidence, indication）之间是“同等”的关系，是要说明这个名词的具体内容的。
The news that we are having a holiday tomorrow is not true.
    The boss agreed on the idea that we reduced the total of production.  
    We all know the fact that our earth is short of fresh water.
    There is indication that fresh water is decreasing in many places.
    5．定语从句
    限定性定语从句和非限定性定语从句
    I want this man, who (=for he) can speak English.
    He gave up the plan, which was a very good one.
    I met John, who told me the news.
    I well take this one, which seems to be the best one.
    He has two sons, who work in the same company. (He has only two sons.)
    He has two sons who work in the same company. (Perhaps he has more than two sons.)
    6．状语从句
    1）时间状语从句
    when, whenever, while, as, before, after, until, till, by the time, as soon as, hardly…when, no sooner…than, the moment, the minute, immediately, directly, instantly
（1）when, whenever, as和while
    when:表示某个具体时间，所引导的从句的动作或是主句的动作同时发生，或者先于主句动作。既可指一段时间，也可指一点时间。既可表示一时的动作，也可表示连续的动作。
    When the bell rang, the guard was waiting in his seat. (强调一点的时间)
    Whenever: 指任何一个不具体的时间。
The governor ordered the Alterfers to bow before the cap whenever they passed.
总督命令阿尔托，每次走过这个地方，都要向帽子鞠躬。
as: 一边表示从句动作和主句动作同时发生，具有延续含义。一般同连续性动词连用。可翻译为“一边……一边……”或“正当……的时候”
Nathan Hale looked round as a British soldier put the rope around his neck.
当一个英国士兵吧绳子套在内森•黑尔的脖子上时候，他往四周看了看。
while: 只表示延续性的动作或状态，不能表示短暂动作。可翻译为“一边……一边……”或“正当……的时候”。
While ants grow they change their forms three times. 蚂蚁成长时，形状要改变三次。
He entered the room when/while/as the meeting was going on.
While/As Jim was reading, Jack was writing.
（2）before 和 after都是表示两个时间或者事件的顺序。
before引导的从句动作发生在主句之后。从句过去时，主句过去完成时。
They had got everything ready before I arrived.
after 引导的从句动作发生在主句之前。主句过去时，从句过去完成时。
After he had worked in the factory for ten years, he went abroad.
before 有时候可以替换成when, 但是主句是it 时，只能用before.
It was not long before he sensed the danger of the position. 不久，他就感觉到了情况的危及。
如果不强调时间的先后顺序，after和before句子结构中的谓语动词也都可以用一般过去时。
Three months went by before Dongdong knew it. 东东不知不觉过了三个月。
（3）The minute, the moment, the instant, as soon as, immediately, presently, directly…都表示：从句动作一发生，主句动作就发生。一……就……
I shall come as soon as I’ve finished supper. 我一吃完晚饭就来了。
They told me the news immediately they got the message. 他一得到口信，就把消息告诉我们。
I recognized you the minute I saw you. 我一见你就认出了你。
此外，一些词组：the day, the first time, the last time, next time, the week, the morning, the afternoon等，也作为连词，引导时间状语从句。
He called on me the day he arrived. 他来的那一天就拜访了我。
Every time I catch a cold, I have pain in my back. 我每次感冒都背疼。
The truck will have arrived by the time you have all the things packed up.
你把东西一捆好，卡车也就来了。
（4）Hardly…when 和 no sooner…than 相当于 as soon as 之意，也可以引导时间状语从句。从句用一般过去时，主句用过去完成时。有自然语序和倒装语序。
He had hardly fallen asleep when he felt a soft touch on his shoulder.
= Hardly had he fallen asleep when he felt a soft touch on his shoulder.
他刚要入睡就感到肩膀被轻轻一触。
I had no sooner come home than it began to rain.
= No sooner had I come home than it began to rain.
我一回家就下雨了。
（5）till 和 until意思为：直到…，一直…为止。表示一个动作持续到某个时间点，或某一动作发生为止。用法相近。
在句首，只能用Until.
Until you told me I had no idea of it. 在你告诉我之前，我对此事一无所知。
在强调句结构中，或者与not连用，只能用until.
It was not until the old worker came that we began the experiment.
直到老工人来了以后，我们才开始了这个实验。
He didn’t enter the room until I returned. 直到我回来，他才进入房间。
注意：否定句可用另外两种句式表示。
Not until …在句首，主句用倒装。
Not until the early years of the 19th century did man know what heat is.
直到19 世纪初，人类才知道热能是什么。
Not until I began to work did I realize how much time I had wasted.
直到我开始工作，我才认识到了我已蹉跎了几多岁月。
（6）since的用法。
表示“自从…开始”谓语动词一般是非延续性动词。
I have written home but once since I came here. 自从来到这里，我只写了一封信回家。
It is + 时间+ since 从句句型中，时间的计算从since从句的动作完成或状态结束时算起。
It is three years since she was in our class. 她离开我们班有三年了。
It is three years since he lived here. 他不在这里住有三年了。
It is three years since I smoked a cigar. 我戒烟有三年了。
区别it is …since…和 it is …that…
It is four years since he has lived here. = He hasn’t lived here for four years.她不在这里住有四年了。
It is four years that he has lived here. = He has lived here for four years. 她在这里住了四年了。
    2）地点状语从句
    Where 和 wherever 引导的。Where:在某个地方。 Wherever: 指在任何一个地方。
    Where I live, there is plenty of rain. 我出生的地方雨水多。
    Make a mark where you have any questions. 有疑问的地方做个记号。
    He will work wherever the people need him. 人们哪里需要他，他便在哪里工作。
    Wherever you go, you should do your work well. 无论你走到哪里，都该吧工作做好。
    3）原因状语从句
    because, as, since, now that, for 等引导原因状语从句
    because 表原因语气最强烈，常用回答疑问词“why”引导的疑问词。
    Because he did not obey the regulations, he was punished.
    since:表示一种附带的原因，或表示已知的，显然的理由意为“既然”引导的从句放在句首。
    Since a lot of people make mistakes in life, Mr. Smith wanted to give John a chance.
    既然很多人在一生都会犯错误，史密斯先生想给约翰一个机会。
    as: 表示的理由最弱，只是对主句附带说明，重点在主句上。
As the tree was a very small one, it doesn’t take long to cut it down. 因为数小，砍它没花多少时间。
now that: 意思与 as, since 相近。有“鉴于某个事实，原因是…”的意思。
Now that everybody has come, let’s begin our conference. 大家都来了，我们就开会吧。
Not that…but that… 意思为：不是因为，而是因为
Not that I don’t like the film, but that I have no time for it.
不是因为我不喜欢这部电影，而是因为我没有时间看。
    4）条件状语从句
    常用引导词：if, unless，Provided (that), so (as) long as 只要
    Start our project if the president agrees.
    I shall go tomorrow unless it rains.
    You will certainly succeed so long as you keep on trying.
    Provided that there is no opposition, we shall hold the meeting here.
    only if 和 if only
only if:用陈述语气：只要…   if only:用虚拟语气：要是…就好了。
Only if we persist in carrying out the open-door policy, we will achieve greater success in
5）让步状语从句
though, although
注意： 当有though, although时，后面的从句不能有but，但是 though 和yet可连用
Although it's raining, they are still working in the field. 虽然在下雨，但他们仍在地里干活。
He is very old, but he still works very hard. 虽然他很老，但仍然努力地工作。
Though the sore be healed, yet a scar may remain. 伤口虽愈合，但伤疤留下了。 （谚语）
as, though 引导的倒装句
as / though引导的让步从句必须表语或状语提前（形容词、副词、分词、实义动词提前）。
Child as /though he was, he knew what the right thing to do was.
  = Though he was a small child, he knew what the right thing to do was.
    注意：
a.句首名词不能带任何冠词。
b.句首是实义动词，其他助动词放在主语后。如果实义动词有宾语和状语，随实义动词一起放在主语之前。
Try hard as he will, he never seems able to do the work satisfactorily.
  = Though he tries hard, he never seems…
    虽然他尽了努力，但他的工作总做的不尽人意。
ever if, even though.　即使
We'll make a trip even though the weather is bad.
Whether---or--- 不管------都------
Whether you believe it or not, it is true.
"no matter +疑问词" 或"疑问词+后缀ever"
No matter what happened, he would not mind.
Whatever happened, he would not mind.
6）方式状语从句
方式状语从句通常由as, (just) as…so…, as if, as though引导。
（1） as, (just) as…so…引导的方式状语从句通常位于主句后，但在(just) as…so…结构中位于句首，这时as从句带有比喻的含义，意思是"正如…"，"就像"，多用于正式文体，例如：
Always do to the others as you would be done by. 你希望人家怎样待你，你就要怎样待人。
As water is to fish, so air is to man. 我们离不开空气，犹如鱼儿离不开水。
Just as we sweep our rooms, so we should sweep backward ideas from our minds.
正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。
（2）as if, as though
两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反，有时也用陈述语气，表示所说情况是事实或实现的可能性较大。汉译常作"仿佛……似的"，"好像……似的"，例如： 
They completely ignore these facts as if (as though) they never existed.
他们完全忽略了这些事实，就仿佛它不存在似的。（与事实相反，谓语用虚拟语气。）
He looks as if (as though) he had been hit by lighting.
他那样子就像被雷击了似的。（与事实相反，谓语用虚拟语气。）
It looks as if the weather may pick up very soon.
看来天气很快就会好起来。（实现的可能性较大，谓语用陈述语气。）
说明：as if / as though也可以引导一个分词短语、不定式短语或无动词短语，
He stared at me as if seeing me for first time. 他目不转睛地看着我，就像第一次看见我似的。　
He cleared his throat as if to say something. 他清了清嗓子，像要说什么似的。
The waves dashed on the rocks as if in anger. 波涛冲击着岩石，好像很愤怒。
    7）目的状语从句
表示目的状语的从句可以由that, so that, in order that, lest, for fear that, in case等词引导，其中，lest, for fear that, in case后面往往要跟虚拟语气，即 should+动词原形
You must speak louder so that /in order that you can be heard by all.
He wrote the name down for fear that (lest) he should forget it.
Better take more clothes in case the weather is cold.
    8）结果状语从句
结果状语从句常由so… that 或 such…that引导，掌握这两个句型，首先要了解so 和 such与其后的词的搭配规律。
The boy is so young that he can't go to school.
He is such a young boy that he can't go to school.
    9）比较状语从句由than, as等引导，注意这类从句的省略式和变体比较多，如表示两种情况同时变化的句型“the + 比较级……，the +比较级…… （越……越……）”、三者或三者以上比较的句型“the +最高级+ of / in + 比较范围（……之中最……）”等，都值得注意。
    The number of population in 1998 is twice as much as that in 1958.
    The quicker you get ready, the sooner we’ll be able to leave.
    Autumn is the best season in Beijing.
    四、并列复合句
    一个完整的句子如果既含有并列句又含有复合句，就是并列复合句（Compound Complex Sentences）。这种句子结构虽然复杂，但是这种有形的连接手段可以使得整个句子错落有致，清晰地表达思想，在写作中运用恰当，可以避免句型单调的问题。
    Some students don’t know how they can spend the two-day weekend, so you may find them playing cards or sleeping whenever you go to their dorms.