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句子的种类
（ Classification ）
1
陈说句分肯定句和否认句两种。陈说一件肯定的事实，我们用肯定句；陈说一件否认的事实，我们就用否认句。
（肯定式、否认式）
（ Declarative Sentence ）
否认句的构成
改为否认句:
1) Lily and liz are twins.
2)There’s some Coke in the bottle, but
there orange juice.
3)I have (有)a hamburger,
but l sandwiches.
Lily and liz are not/aren’t twins.
is not any/no
have not any/no
1. be动词后直接加not构成否认。
当have/has表达“有”时, 其后直接加not构成否认。
1) I go to work by bike every day.(改为否认句)
2) Mr Li teaches us maths.(改为否认句)
3) They had an English lesson this morning.(改为否认句)
I do not (don’t) go to work by bike every day.
Mr Li does not (doesn’t) teach us maths.
They did not (didn’t) have an English lesson this morning. （此处have不作“有”解而表达动作)
，必须用助动词
do/does/did +动词原形构成否认句。
1) He will feel tired after hard work.(否)
He feel tired after hard work.
2) We should obey the traffic rules. (否)
We play in the street. (must)
3) They had seen the film before. (否)
They seen the film before.
will not ( won’t )
had not ( hadn’t )
mustn’t
，情态动词的否认形式是在助动词/情态动词后＋not, 再加对应的动词。
＊当have/has/had表达“有”时, 其后直接加not构成否认。
＊当have不表达“有”而表达动作时，应使用don’t/ doesn’t/ didn’t+ have,不能用has/ have/ had not.
＊在目前/过去完毕时态的否认句中，have/has/had是助动词, 其否认形式直接用haven’t/ hasn’t/ hadn’t表达。
They have already finished their work.
→ They haven’t finished their work yet.
About have/ has/ had
1. My father was a teacher in his forties.
2. Tom’s parents will leave for Beijing tomorrow.
3. Jane can sing lots of songs.
4. Betty used to go to work on foot.
5. They were watching TV at that time.
6. I like having a barbecue in hot weather.
7. There are some fish in the river.
8. My grandma lives in Sichuan.
Have a try!
Change the following sentences into negative:
9. Jack has 100 coins in the box.
10. The children had a good time in the park.
11. She’s made an apology to her mum.
12. He does his homework very carefully.
13. Ben read the letter again and again.
More practice:
He doesn’t do his homework very carefully.
The children didn’t have a good time in the park.
She hasn’t made an apology to her mum.
Ben didn’t read the letter again and again.
( cut cut cut , put put put , cost cost cost )
Jack doesn’t have 100 coins in the box.
3
（ Interrogative Sentence and Answer ）
提出问询的句子被称为疑问句。疑问句重要分为一般疑问句、特殊疑问句、选择疑问句、反意疑问句。