引言：改写句子是英语学习的重要环节，它不仅能够提高学生的语言表达能力，而且对培养学生的逻辑思维和创造性思维也有很大的帮助。尤其对于六年级的孩子来说，掌握改写句子技巧是十分必要的。
1. 句型变换法：通过将一个句子中的主语、谓语、宾语、状语等成分进行变换，从而改变句子结构，达到改写句子的目的。
2. 合并句子法：将两个或多个简单句合并成一个复合句或者复杂句，从而达到改写句子的目的。
3. 分解句子法：将一个复杂句分解成若干个简单句或者复合句，从而达到改写句子的目的。
4. 变换语态法：将一个主动语态的句子转换为被动语态，或者将一个被动语态的句子转换为主动语态，从而达到改写句子的目的。
5. 词汇替换法：将一个句子中的某些词汇替换成同义词或者近义词，从而达到改写句子的目的。
6. 语意转换法：通过对句子中的某些词汇或者词组进行语意转换，从而达到改写句子的目的。比如将“happy”的反义词“sad”来代替“happy”，从而改变整个句子的语意。
下面是20个精选的例句：
1. 原句：Tom is good at playing basketball.
改写后：Playing basketball is something Tom is good at.
2. 原句：She went to school very early this morning.
改写后：This morning she went to school very early.
3. 原句：The teacher gave us a lot of homework yesterday.
改写后：We got a lot of homework from the teacher yesterday.
4. 原句：The dog barked loudly at me.
改写后：Loud barks were directed at me by the dog.
5. 原句：The boy finished his homework before dinner.
改写后：Before dinner, the boy completed his homework.
6. 原句：The book on the shelf belongs to me.
改写后：I own the book on the shelf.
7. 原句：She has a beautiful voice.
改写后：Her voice is very beautiful.
8. 原句：The car was repaired by the mechanic.
改写后：The mechanic fixed the car.
9. 原句：The teacher asked me a question, but I didn't know the answer.
改写后：I didn't know the answer to the question the teacher asked me.
10. 原句：The cat is sleeping on the mat.
改写后：On the mat, the cat is sleeping.
11. 原句：I am going to visit my grandparents on Sunday.
改写后：On Sunday I will go to visit my grandparents.
12. 原句：The girl with long hair is my sister.
改写后：My sister is the girl with long hair.
13. 原句：The dog chased the cat around the corner.
改写后：Around the corner, the cat was chased by the dog.
14. 原句：He usually gets up late on weekends.
改写后：On weekends, he usually gets up late.
15. 原句：The children played happily in the park.
改写后：In the park, the children played happily.
16. 原句：The red car belongs to my father.
改写后：My father owns the red car.
17. 原句：The girl is reading a book in the library.
改写后：In the library, the girl is reading a book.
18. 原句：The train arrived at the station on time.
改写后：On time, the train arrived at the station.
19. 原句：The boy is wearing a red hat.
改写后：A red hat is being worn by the boy.
20. 原句：The baby is sleeping soundly in his mother's arms.
改写后：Sleeping soundly, the baby is in his mother's arms.
结语：以上方法可以帮助六年级的孩子们更好地改写句子，提高语言表达能力。同时，学生们还需要在不断地练习中不断提升自己的语言水平，自己动手改写句子，把这些方法运用到实践中去，这样才能真正做到融会贯通。
