（一） 按目的分为：
陈述句：用来陈述一件事或表示一种看法。Nobody agrees with what you said. 疑问句：一般，Is there something wrong with your pen?
特殊，Why don’t you try a second time?
选择，Shall we have a cup of coffee or start our talk at once? 反意，He can’t swim, can he?
感叹句：用以表示快乐、痛苦等强烈感情，用what 或 how 开头的两种形式。 How beautiful the flower is!
What a strange guy!
祈使句：用以表示命令，请求或建议，主语通常省略。
Don ’t be late again.
Mind your own business.
Open the door.
Clean the blackboard.
(二) 按结构分：
简单句:只有一个主语（或并列主语）和一个谓语（或并列谓语）的句子。 The bike is new. The map is on the wall.
He can swim. Nothing happened.
I like the white dress. Tom often sings the song.
She showed her friends all her pictures. He gave me a birthday present. We must keep our classroom clean.
并列句：两个或以上的简单句，由并列连词连缀成一个句子。常用的并列连词有：and, but, so, or, when, while, for, not only,,, but also; either,,, or,,,, ; neither .,, nor,,, 等。
I help him and he help me.
He didn’t catch the early bus, so he was late this morning.
He isn’t very clever, but he work hard.
复合句：由一个主句加一个或几个从句所构成的句子，由从属连词（引导词）连缀成一个句子。从句只作句子的一个成分，不能独立。
根据作用分：1名词性从句 （主从，宾从，表从，同位从）
2定语从句 （限定性定从和非限定性定从）
3状语从句 （时间状从，条件状从，方式状从，目的状从，比较状从，原因状从，地点状从，结果状从，让步状从）
如：What you need is more practice.
It is obvious that he’s right.
He said that he felt sick.
She made it clear that we must arrive on time.
I am sure that he will succeed.
The question is whether we should ask them for help.
We heard of the news that our team had won.
She is the girl who met me yesterday.
Tom ’s father, who is over sixty, still works hard.
The train had left when I got to the station.
I ’ll go with you to the cinema this evening if I’m free.
The students went to the farm because the farmers needed some help. He drove so carelessly that his car crashed into a tree.
I am saving money so that I can buy a house.
You may do as you please.
I know you better than he does.
We shall go where working conditions are difficult.
Although it rained heavily, they still went out.
注：非谓语动词
不能在句中作谓语的动词形式。它包括不定式，动名词和分词。
（一） 按目的分为：
陈述句：用来陈述一件事或表示一种看法。Nobody agrees with what you said. 疑问句：一般，Is there something wrong with your pen?
特殊，Why don’t you try a second time?
选择，Shall we have a cup of coffee or start our talk at once? 反意，He can’t swim, can he?
感叹句：用以表示快乐、痛苦等强烈感情，用what 或 how 开头的两种形式。 How beautiful the flower is!
What a strange guy!
祈使句：用以表示命令，请求或建议，主语通常省略。
Don ’t be late again.
Mind your own business.
Open the door.
Clean the blackboard.
(二) 按结构分：
简单句:只有一个主语（或并列主语）和一个谓语（或并列谓语）的句子。 The bike is new. The map is on the wall.
He can swim. Nothing happened.
I like the white dress. Tom often sings the song.
She showed her friends all her pictures. He gave me a birthday present. We must keep our classroom clean.
并列句：两个或以上的简单句，由并列连词连缀成一个句子。常用的并列连词有：and, but, so, or, when, while, for, not only,,, but also; either,,, or,,,, ; neither .,, nor,,, 等。
I help him and he help me.
He didn’t catch the early bus, so he was late this morning.
He isn’t very clever, but he work hard.
复合句：由一个主句加一个或几个从句所构成的句子，由从属连词（引导词）连缀成一个句子。从句只作句子的一个成分，不能独立。
根据作用分：1名词性从句 （主从，宾从，表从，同位从）
2定语从句 （限定性定从和非限定性定从）
3状语从句 （时间状从，条件状从，方式状从，目的状从，比较状从，原因状从，地点状从，结果状从，让步状从）
如：What you need is more practice.
It is obvious that he’s right.
He said that he felt sick.
She made it clear that we must arrive on time.
I am sure that he will succeed.
The question is whether we should ask them for help.
We heard of the news that our team had won.
She is the girl who met me yesterday.
Tom ’s father, who is over sixty, still works hard.
The train had left when I got to the station.
I ’ll go with you to the cinema this evening if I’m free.
The students went to the farm because the farmers needed some help. He drove so carelessly that his car crashed into a tree.
I am saving money so that I can buy a house.
You may do as you please.
I know you better than he does.
We shall go where working conditions are difficult.
Although it rained heavily, they still went out.
注：非谓语动词
不能在句中作谓语的动词形式。它包括不定式，动名词和分词。