“句子成分”:考点讲解.doc

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1、 句子成分组成句子的各个部分叫做句子成分。它包括:主语、谓语、宾语、定语、状语、表语、补语和同位语。各成分在句中的作用如何?分别由哪些词及短语充当? 1.主语:是句子要说明的人或事物,是句子的主体,一般由名词、代词、数词、不定式或动名词等充当。如: The car is running fast.(名词)We are students.(代词) One of my classmates is from Shanghai.(数词) Its bad manners to spit in public.(不定式)Eating too much is bad for your health.(动名词)

2、【注意】若不定式短语作主语常用it作形式主语,而把真正的主语(不定式短语)放在句后。2.谓语:说明主语的动作或状态,也是句子的主体部分,一般由动词充当。动词分为实义动词、连系动词、情态动词和助动词。实义动词单独作谓语,连系动词与表语一起构成谓语,情态动词与省略to的不定式构成合成谓语,助动词与动词原形共同构成谓语部分。如:He works in a factory.(实义动词)I felt cold.(系动词表语)How can I get to the station?(情态动词实义动词)Do you speak English?(助动词实义动词)They are working in a

3、field.(助动词实义动词) 【注意】谓语与主语在人称与数方面要相互照应。3.宾语:是及物动词所涉及的对象,一般由名词、代词、不定式及动名词等充当。如:He is doing his homework.(名词) They did nothing this morning.(代词)She wants to go home.(不定式)We enjoy playing football.(动名词)【注意】有的动词可接双宾语:间接宾语指人,直接宾语指物。这类动词常见的有:give,buy,lend,pass, tell,leave等。如:He bought me a book.Pass me the

4、 ball,will you?(间宾直宾) 直接宾语一般放在间接宾语之后,但若把直接宾语放在前面,则要在间接宾语前加适当的介词如to或 for等。如:Han Chen lent some money to Li Hai.(直宾间宾) Xiao Liu bought a dictionary for Tom.(直宾间宾)有的动词常用不定式作宾语,而不能用动名词。这类动词有:want,wish, hope,promise,decide,agree, choose,care等。如:I hope to see you again.有的动词一般只用动名词作宾语,而不用不定式。这类动词有:enjoy,fi

5、nish,mind,practise,miss, suggest,keep(on)等。如:Do you mind my opening the window? 有的动词后接不定式与动名词含义不同。a)forget to do表示“未发生的动作”,forget doing表示“已完成的动作”。如: Dont forget to come here earlier tomorrow.(还没来)I forgot returning the book to him.(书已还给他了)b)stop to do(不定式为状语)表示“停下 原来的事,去做另一件事”,stop doing表示“停止做某事”。如:

6、I stopped to talk with him.(我停下来与他谈话。) The students stopped talking when the teacher came in.(老师进来时学生们停止谈话。)4.定语:用于修饰名词或代词,一般由形容词、名词、数词、不定式等充当。如:What a beautiful kite it is!(形容词) She is a chemistry teacher.(名词)There are two students in the classroom.(数词)We have something to do tomorrow.(不定式)The man

7、in blue is my brother.(介词短语)【注意】定语一般位于被修饰词之前,但若修饰不定代词或不定式等短语作定语,则放在后面。 5.状语:用于修饰动词、形容词、副词或全句,一般由副词、介词短语、不定式短语或从句充当。单个副词作状语一般放在被修饰词之前,短语或从句放在句首或句末。如:Thank you very much.(副词)I get up at five in the morning.(介词短语)He is studying hard so as to catch up with others.(不定式短语)We were having breakfast when the

8、 telephone rang.(从句)【注意】enough作状语只能放在被修饰词之后。如: He is old enough to go to school. 6.表语:用于说明主语的身份、特征或感受,一般由名词、数词、形容词、分词等充当。常用的连系动词有:be,look,get,sound(听起来),feel,become, smell,turn,taste(尝起来)等。如:They are workers.(名词)Two and three is five.(数词)The story is very interesting.(形容词)M y job(工作)is teaching Engl

9、ish.(动名词) She is at home.(介词短语) I feel terrible.(形容词)The dish tastes delicious.(形容词)7.补语:用于补充说明宾语的动作,一般位于宾语之后,宾语与宾语补足语一起构成复合宾语。需接复合宾语的动词有:tell,let,help,teach, ask,see,have,order,make等。“宾补”一般由不定式短语、分词、名词、形容词等充当。如:We elected him monitor.(名词)I found it difficult to learn English well.(形容词)The doctor to

10、ld me to do more exercise.(不定式短语)He is going to have his hair cut.(过去分词) They saw a bird flying in the sky.(现在分词) 8.同位语:由两个或两个以上同一层次的语言单位组成的结构,其中前项与后项所指相同,句法功能也相同,后项是前项的同位语。Mr. Smith, our new teacher, is very kind to us. (Mr.smith和our new teacher是指同一个人,所以 Mr smith即为our new teacher 的同位语。) 如同位语与其同位成分关

11、系紧密时不用逗点隔开;如同位语对其同位成分只作补充解释时可用逗点隔开。He told me that his brother John is a world-famous doctor. brother和John都是单一的字作同位语,与其同位成分之间不用逗点隔开。同位语除表示其同位成分的全部意义外,还可以表示部分意义。We Chinese people are brave and hardworking.综上所述可以看出你的第一个例子是同位语从句,we和each是同位语,each是对we的补充,解释为我们每个人,加起来肯定是超过一个人的,所以谓语动词就需要用动词的复数形式。而第二句则不是,each of us指明了是我们中的每一个人,可以看成是已经从we中作为单个个体分离出来了,所以谓语就需要用has.

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