一、简单句、并列句和复合句
1、简单句
①一个句子如果只包含一个主谓结构就是简单句。例如：
I must pay attention to my spelling.(拼写）
I (主语）am（谓语） an English teacher.
She(主语） speaks（谓语） loudy.
注：一般情况下，主语是名词，谓语是动词。
②有时句子虽长，但只有一个主谓结构，就是简单句。例如：
Yesterday, we(主语） went （谓语）to an exhibition on the life and work of Lenin, the great revolutionary lea-der of the working class.
③有时一个句子有两个（或者两个以上）并列的主语或者谓语，也仍是简单句。例如：
There he was a leader of the student movement and took an active part in revolutionary wo-rk. 双谓语
Both the teachers and the students were very active in physical labour.双主语。
Comrade and I often study together and help each other.
2、并列句
一个句子如果包括两个或者更多的互不依从的主谓结构，就成为并列句。例如：
He was always close to the people,and the people loved him.
I didn't make any mistakes in the test, but my handwriting was poor.
Some are walking in the lake ,others are sitting on the beaches and chatting.
并列的各个部分（即各个主谓结构）称为分句。
各个分句用并列连词（如and，but）连接；在上下文紧密联系的情况下也可不用连词，而用逗号隔开（如上面第三句话）。
3、复合句
一个句子中，如果有一个或者更多的成分是主谓结构，就称为复合句。例如：
I hope you will help me with my grammar(语法）。（作宾语）
He took full notes while he read.----作状语
My idea is that we go by bicycle.---作表语
这种作为一个句子成分的主谓结构称为从句（以别于主句，即全句的主要部分）。
按照句法作用的不同，从句又可以分为：
主语从句、宾语从句、定语从句、状语从句和表语从句
注：如果一个并列句中某一分句是一个复合句，称为并列复合句。如：
He was very busy(,but he said he would come.（复合句）----------并列复合句
4、状语从句
状语从句的复合句很多，有的表示时间，有的表示条件、原因等，因此可以分为：
时间状语从句、条件状语从句、原因状语从句
①时间状语从句：
---After he finished school there, he went to the University of Kazan.
---We livde in the peasants' homes when we were in the countryside.
---She was in Nanking before she came here.
---Every time the cock began to crow, he would shout:"Get up,you lazy-bones!"
②条件状语从句
If you have any questions, write them on a slip of paper.（一张纸条）
婆婆带孩子出去玩，我学习来不及吃饭，到了饭点，不一会儿公公端过来一碗热腾腾的汤圆。真是感恩二老！
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