1、按句子的用途
分四种：
1）陈述句（肯定、否定）：He is six years old; She didn't hear of you before.
2）疑问句（一般、特殊、选择、反意）：Do they like skating? How old is he? Is he six or seven years old? Mary can swim, can't she?
3）祈使句：Be careful, boys; Don't talk in class
4）感叹句：How clever the boy is!
2、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）。
e.g. 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。e.g. 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。复合句包含：名词性从句（主语从句、宾语从句、表语从句和同位语从句）、定语从句和状语从句等。e.g. The foreign visitors took a lot of pictures when they were at the Great Wall.
简单句的五种基本句型
1、主语+系动词+表语：e.g. He is a student.
2、主语+不及物动词：e.g. We work.
3、主语+及物动词+宾语：e.g. Henry bought a dictionary.
4、主语+及物动词+双宾语（间接宾语+直接宾语）：e.g. My father bought me a car.
5、主语+及物动词+复合宾语（宾语+宾补）：e.g. Tom made the baby laugh.
注：其他各种句子都可由这一种基本句型扩展、变化或省略而构成。
并列句的分类
（注：图中第二句动词笔误，你一定看到了吧。）
1、表示连接两个同等概念，常用and, not only…but also…, neither…nor…等连接。e.g. The teacher's name is Smith, and the student's name is John.
2、表示选择，常用的连词有or, either…or…等。e.g. Hurry up, or you'll miss the train.
3、表示转折，常用的连词有but, yet, while, when等。e.g. He was a little man with thick glasses, but he had a strange way of making his classes lively and interesting.
4、表示因果关系，常用的连词有so, for等。e.g. August is the time of the year for rive harvest, so every day I work from dawn until dark.
主从复合句的分类
1. 名词性从句
从句起名词的作用，包括宾语从句，主语从句，表语从句，同位语从句。
That he will come here to see us is certain. 主语从句
He said that he was from Hunan Province. 宾语从句
My dream is that I will have my own company. 表语从句
His suggestion that we be there waiting for them is reasonable. 同位语从句
2. 形容词性从句
形容词起修饰限定的作用，所以形容词性从句就是定语从句。
The prize will go to the writer whose story shows the most imagination.
Ted came for the weekend wearing only some shorts and a T-shirt, which is a stupid thing to do in such weather.
Mary was much kinder to Jack than she was to the others, which, of course, make all the others upset.
3. 副词性从句
副词多作状语，所以副词性从句指各种状语从句。
I had felt hungry beforeI arrived home. 时间状语从句
Make a mark where you have problems.地点状语从句
They will come home after school if they finish their work. 条件状语从句
As it's dark, we'd better go off work now.原因状语从句
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