【含答案解析】人教版三年级英语句型转换基础练习题20题

【含答案解析】人教版三年级英语句型转换基础练习题20
题
1. This is a cat. (变为否定句)
A. This not is a cat
B. This is no a cat
C. This isn't a cat
D. This no is a cat
答案解析：C。

在英语中，将肯定句变为否定句时，be动词（这里是is）的否定形式是isn't，所以This isn't a cat是正确的。

2. I am a student. (变为一般疑问句)
A. Am I a student
B. Are you a student
C. Is I a student
D. Do I a student
答案解析：A。

将陈述句变为一般疑问句时，把be动词（这里是am）提前，所以Am I a student是正确的。

3. He has a book. (变为否定句)
A. He has no a book
B. He not has a book
C. He doesn't have a book
D. He haven't a book
答案解析：C。

原句中的has是实义动词，在变为否定句时，要借助助动词
does，并且实义动词变为原形，所以He doesn't have a book正确。

4. They are in the park. (变为一般疑问句)
A. Are they in the park
B. They are in the park?
C. Is they in the park
D. Do they in the park
答案解析：A。

将含有be动词（这里是are）的陈述句变为一般疑问句，将be动词提前，所以Are they in the park正确。

5. She likes apples. (变为否定句)
A. She not likes apples
B. She doesn't likes apples
C. She doesn't like apples
D. She like no apples
答案解析：C。

原句中的likes是实义动词，变为否定句时借助助动词does，且动词还原为原形，所以She doesn't like apples正确。

6. There is a dog under the tree. (变为一般疑问句)
A. Is there a dog under the tree
B. There is a dog under the tree?
C. Are there a dog under the tree
D. Do there a dog under the tree
答案解析：A。

There be句型变为一般疑问句时，将be动词（这里是is）提前，所以Is there a dog under the tree正确。

7. We play football. (变为否定句)
A. We not play football
B. We don't play football
C. We no play football
D. We play not football
答案解析：B。

原句中的play是实义动词，变为否定句时借助助动词do，然后加not，缩写为don't，所以We don't play football正确。

8. It is a red pen. (变为一般疑问句)
A. Is it a red pen
B. It is a red pen?
C. Are it a red pen
D. Do it a red pen
答案解析：A。

含有be动词（这里是is）的陈述句变为一般疑问句，将be 动词提前，所以Is it a red pen正确。

9. My mother cooks dinner. (变为否定句)
A. My mother not cooks dinner
B. My mother doesn't cook dinner
C. My mother cook no dinner
D. My mother don't cook dinner
答案解析：B。

原句中的cooks是实义动词，变为否定句时借助助动词does，且动词还原为原形，所以My mother doesn't cook dinner正确。

10. The boys are happy. (变为一般疑问句)
A. Are the boys happy
B. The boys are happy?
C. Is the boys happy
D. Do the boys happy
答案解析：A。

含有be动词（这里是are）的陈述句变为一般疑问句，将be 动词提前，所以Are the boys happy正确。

11. I'm a student. (改为复数句)
We are students.
答案解析：原句中I（我）的复数形式是we（我们），am的复数形式是are，student（学生）的复数形式是students，所以改为复数句就是We are students。

12. He has a pen. (改为复数句)
They have pens.
答案解析：he（他）的复数是they（他们），has（有，第三人称单数形式）的复数形式是have，pen（钢笔）的复数是pens，按照复数句的转换规则进行转换。

13. This is a cat. (改为复数句)
These are cats.
答案解析：this（这个）的复数是these（这些），is的复数形式是are，cat （猫）的复数形式是cats。

14. They are apples. (改为单数句)
It is an apple.
答案解析：they（他们）的单数是it（它），are的单数形式是is，apples（苹果，复数）的单数是an apple，因为apple是元音音素开头，所以用an。

15. We have some books. (改为单数句)
I have a book.
答案解析：we（我们）的单数是I（我），some books（一些书，复数）的单
数是a book，have形式不变。

16. There are three dogs. (改为单数句)
There is a dog.
答案解析：原句中are（是，复数形式）的单数形式是is，three dogs（三只狗，复数）的单数形式是a dog。

17. She is a teacher. (改为否定句)
She isn't a teacher.
答案解析：在be动词is后面加not就可以构成否定句，is not的缩写形式是isn't。

18. They are my friends. (改为否定句)
They aren't my friends.
答案解析：在be动词are后面加not变成否定句，are not的缩写形式是aren't。

19. I can see a bird. (改为一般疑问句)
Can you see a bird?
答案解析：把情态动词can提到句首，I（我）变为you（你），句末用问号，就变成了一般疑问句。

20. He likes apples. (改为一般疑问句)
Does he like apples?
答案解析：因为原句是一般现在时，主语he是第三人称单数，句中没有be 动词，所以要借助助动词does放在句首，likes还原为like。