两个或两个以上的简单句用并列连词或分号连接而成的句子叫并列句。

Eg.Hurry up;it’s getting late.
He has a lot of money and he spent if freely.
常见的并列连词：
and,not only…but also,or,either…or,but,yet,while,so,for等。

when也可用作并列连词，意为“这时，那时”，常用于以下句型：
sb. was doing sth. when…
sb. was about to do/going to do/on the point of doing sth. …when…
sb. had just done sth. … when…
Eg.We were having a meeting______someone broke in.
We were about to set off _______it suddenly began to rain.
I had just finished my homework_____Tom came to me.
Exercises.
1.Shall we go to the cinema_____stay at home?
2.There are many kinds of sports,______my favorite is swimming.
3.Henry is very smart,______many of his classmates like him.
4.I was glad to meet Jenny again,_____I didn’t want to spend all day with her.
5.Don’t turn off the computer before closing all programs,_____ you could have problems.
6.It’s not easy to change habits,______with awareness and self-control,it is possible.
7.You have to move out of the way ____the truck cannot get past you.
8.At school,some students are active _______ some are shy,yet they can be goods friends with one another.
9.Tom was about to close the window_____his attention was caught by a bird.
10.Some animals carry weeds from one place to another,______plants can spread to new places.
由一个主句和一个或几个从句构成的句子叫做复合句。

复合句中，主句是句子的主体，从句充当句子某种成分，由从属连词引导。

复合句包括名词性从句(主语从句、宾语从句、表语从句、同位语从句)，定语从句和状语从句。

从句不能独立存在。

Eg.1).That fashion differs from country to country may reflect the cultural differences from one aspect.( 从句)
2).A computer can only do what you have instructed it to do.( 从句)
3).The doctor’s advice is that you should rest more and drink more.( 从句)
4).A warm thought suddenly came to me that I might use the pocket money to buy some flowers for my mother’s birthday.( 从句)
5).She brought with her three friends,none of whom I had ever met before.( 从句)
6).The man (that/who/whom) I met in the street was a doctor.( 从句)
7).When the teacher came in,we were talking.( 从句)
判断下列句子是简单句、并列句还是复合句：
1. We often study Chinese history on Friday afternoon.( )
2. The boy who offered me his seat is called Tom.( )
3. There is a chair in this room, isn’t there?( )
4. My brother and I go to school at half past seven in the morning and come back home at seven in the evening.( )
5. He is in Class One and I am in Class Two.( )
6. He was fond of drawing when he was yet a child.( )
7. Neither has he changed his mind, nor will he do so.( )
8. What he said at the meeting is very imp ortant, isn’t it?( )
9. The farmer is showing the boy how to plant a tree.( )
10. Both Tom and Jack enjoy country music.( )。