（三）句子的种类
句子是一个独立的语言单位，表示一个完整的思想。

按使用目的可分为陈述句、感叹句、疑问句和祈使句；从结构上又可分为简单句、并列句和复合句。

按使用目的分：
一、陈述句
That boy always helps others.
Tom was not at home yesterday.
He is too late to catch the bus.
二、疑问句（一般疑问句、特殊疑问句、选择疑问句和反意疑问句）
Are you a doctor?
How often do you have an English party?
Which would you like better, tea or coffee?
She is too young to go to school, is she?
三、感叹句
（一）What +a /an+形容词+可数名词的单数形式+主语+谓语！==（二）How+形容词+a/an +可数名词的单数形式+主语+谓语！
What a beautiful girl she is! == How beautiful a girl she is!
(三) What+形容词+可数名词的复数+主语+谓语！
What beautiful girls they are!
(四)What+形容词+不可数名词+主语+谓语！
What fine weather it is!
(五)How+形容词或副词+主语+谓语！
How interesting the dog is!
(六)How+主语+谓语！
How time flies!
四、祈使句（祈使句主语通常被省略，谓语动词用原型。

）
Be quiet!
Don’t be late!
从结构上分：
一、简单句（句子只包含一个主谓结构。

）
He is never late for school.
二、并列句（句子包含两个或多个主谓结构，通常有并列连词连结。

）
She made a promise, but she didn’t keep it.
Tom is tall and he is from America.
He is later for school because his bike is broken.
He not only works hard but also is always ready to help others.
三、复合句（句子包含有两个或更多的主谓结构，但是其中一个或多个主谓结构充当句子的
成分，就是复合句。

所有从句都是复合句。

）
This is the book that I borrowed yesterday.
He told us that light travels faster than sound.
专项练习：
一、分析下列句子的句子结构
1. we are working.。

2. I can swim very well.
3. The waiter brought a bottle of beer to me.
4. Why does the wind blow.
5. The rain has been pulling down for a whole day.
6. Both Tom and Jack enjoy country music.
7. Jim asked you to give his best wishes to everyone.
8. You must get the car ready by tomorrow.
9. I have a lot of clothes to wash.
10. He gave his son some advice on reading.
二、提升训练
1. ---Who is the man over there? It can’t be Li Lei, ____？
--- ____ . It must be John. I saw Li Lei in the classroom just now.
A. is it; Yes, it is
B. can it; No, it can’t be
C. can it; Yes, it must be
D. is it; No, it isn’t
2. ---____ didn’t you go to school today?
---Because my mother was ill.
A. Where
B. When
C. Why
D. How
3. ____from here to your home!
A. How long way it is
B. What a long way is it
C. How long way is it
D. What a long way it is
4. Don’t be discouraged. _____things as they are and you will enjoy every day of your life.
A. Taking
B. To take
C. Take
D. Taken
5. ____has the children burdened with too much homework nowadays?
A. It is who that
B. Who is it that
C. It was who that
D. Who was it that
6. ——I’d like to, but…
——____come please!
A. Do
B. Can
C. May
D. Did
7.____role she played in the film! No wonder she has won an Oscar.
A. How interesting
B. How an interesting
C. What interesting
D. What an interesting。