4)感叹句：How clever the boy is! What a clever boy he is!

　　按句子的结构可分三种：

　　1)简单句：只有一个主语(或并列主语)和一个谓语(或并列谓语)。

　　He often reads English in the morning. Tom and Mike are American boys.

　　She likes drawing and often draws pictures for the wall newspapers.

　　2) 并列句：由并列连词(and, but, or等)或分号(;)把两个或两个以上的简单句连在一起构成。

　　You help him and he helps you.

　　The future is bright; the road is tortuous. 前途是光明的，道路是曲折的。

　　3)复合句：含有一个或一个以上从句的句子。英语从句包括名词性从句(主语从句,表语从句,宾语从句和同位语从句),定语从句和状语从句等。

　　The foreign visitors took a lot of pictures when they were at the Great Wall.

　　三、英语句子成分分析

　　1、主语(subject): 句子说明的人或事物。

　　The sun rises in the east. (名词)

　　He likes dancing. (代词)

　　Twenty years is a short time in history. (数词)

　　Seeing is believing. (动名词)

　　To see is to believe. (不定式)

　　What he needs is a book. (主语从句)

　　It is very clear that the elephant is round and tall like a tree.

　　(It形式主语，主语从句是真正主语)

　　附带复习一下it 作形式主语的一些用法: 当主语部分太长时为了句子平衡采用it作形式主语。所谓形式是指句子的真正主语将在句子末段出现

　　1.it is+名词+从句 :It is a surprise that you give such an answer to this question.

　　2. it is +形容词+从句: It is certain that free medical care will be given to most people in our city.

　　3. It +动词+从句: It appeared that he had a taste for music.

　　4. It be +分词+从句:It is said that Li Tao has been to Europe.

　　2、谓语(predicate):说明主语的动作、状态和特征

　　We study English. He is asleep.

　　3、表语(predicative):系动词之后的成分，表示主语的性质、状态和特征。

　　He is a teacher. (名词)

　　Seventy-four! You don’t look it. (代词)

　　Five and five is ten. (数词)

　　He is asleep. (形容词)

　　His father is in. (副词)

　　The picture is on the wall. (介词短语)

　　My watch is gone / missing / lost. (形容词化的分词)

　　To wear a flower is to say “I’m poor, I can’t buy a ring. ” (不定式)

　　The question is whether they will come. (表语从句)