The document discusses active and passive voice in sentences. It defines active voice as having the subject perform the action of the verb, while passive voice has the subject receive the action. It provides examples of changing sentences from active to passive voice by making the object the subject and using a form of "to be" plus the past participle of the main verb. The document also discusses applying these changes to different tenses and includes exercises to practice transforming sentences.

1. Active Voice
and
Passive Voice

2. What is Active Voice?
Active Voice คือรูปประโยคที่มีประธานของประโยค
เป็นผู้แสดงกริยานั้นโดยตรง
Verb (กริยา) แบ่งเป็นสองแบบ
- Transitive Verb ( กริยาที่มีกรรมมารับ )
Ex. He writes a letter to John.
- Intransitive Verb ( กริยาที่ไม่ต้องมีกรรมมารับ )
Ex. He goes to school every day.

3. What is Passive Voice?
Passive Voice คือรูปประโยคที่ประธานของประโยค
เป็นผู้ถูกกระทา
Verb เป็น Transitive Verb
Ex. A letter is written by Jack.
An apple was eaten by my brother

4. Passive Voice
 A flower is kicked to her by him.

5. His dog was killed a week ago.

6. หลักการเปลี่ยนประโยค
Active Voice เป็น Passive Voice
1. สลับตาแหน่ง ประธาน (Subject) ในประโยค Active Voice
มาเป็น กรรม (Object) ในประโยค Passive Voice
2. นา กรรม (Object) ในประโยค Active Voice
มาเป็น ประธาน (Subject) ในประโยค Passive Voice
3. กริยาแท้ ในประโยค ต้องตามหลัง Verb to be และเปลี่ยนกริยานั้น
เป็น กริยาช่องที่ 3 ( past participle )
4. ใช้ Verb to be ให้ถูกต้องตาม Tense ในประโยค
Active Voice

7. Active and Passive Voice
 Mother made a cake.
 John is riding a
motorcycle.
 A cat is eating a fish.
 Who called me?
 A cake was made by
mother.
 A motorcycle is being
ridden by John.
 A fish is being eaten by
a cat.
 By whom was I called?

8. Active and Passive Voice
 John shot Jane yesterday.
 John was shot yesterday.
 I built a house.
 A house was built (by me).

9. Passive Voice
(S + V. to be + V3 + by Obj.)
 A cat eats a rat.
= A rat is eaten by a cat.
 A cat ate a rat.
= A rat was eaten by a cat.
(Present Simple)
(Past Simple)

10. Passive Voice
(S + V. to be + V3)
 A cat is eating a rat.
 A rat is being eaten by a cat.
 A cat was eating a rat.
 A rat was being eaten by a cat.
(Present Continuous)
(Past Continuous)

11. Passive Voice
(S + V. to be + V3)
 A cat will eat a rat.
 A rat will be eaten by a cat.
 A cat will have eaten a rat.
 A rat will have been eaten by a cat.
(Future Simple)
(Future Perfect)

12. Passive Voice
(S + V. to be + V3)
 A cat has eaten a rat.
 A rat has been eaten by a cat.
 A cat had eaten a rat.
 A rat had been eaten by a cat.
(Present Perfect)
(Past Perfect)

13. ถ้า Passive Voice เป็นประโยคคาถาม ให้ทาดังนี้
 What do you eat?
= What are eaten by you?
 What did he drink?
= What was drunk by him?
 Who killed him?
= By whom was he killed?
 Who stole money?
= By whom was money stolen?

14. ถ้า Passive Voice เป็นประโยคคาสั่ง ให้ทาดังนี้
( Let + obj. + be + V3 )
 Close the window.
= Let the window be closed.
ถ้า Passive Voice เป็นประโยคคาสั่งห้าม ให้ทาดังนี้
( Don’t let + obj. + be + V3 )
 Don’t eat it.
= Don’t let it be eaten.

15. Exercise. 1:
1. The book is read by her.
2. A bird is being shot by John.
3. Sandwiches are made by mother.
4. Table Tennis is played by them.
5. A car is always driven by father.
6. Flowers are being watered by Tony.
7. A ball is being looked for by them.
8. A baby is being carried by a nurse.
9. A cup of tea is being drunk by Penny.

16. 10. Two glasses of milk are drunk by her.
11. A piece of paper is being cut by a boy.
12. Two children are being run after by a dog.
13. They are seen by me.
14. I am seen by a teacher.
15. Plates are being washed by them.
16. Mathematics was being taught by
Miss Brown.

17. 17. A new hat was bought by Jill.
18. Let your homework be done.
19. Her homework wasn’t done by Alison.
20. Apples weren’t bought by Jason.
21. A snake is seen by Elizabeth.
22. Plates are washed by Simon.
23. Newspaper is read by her every day.
24. Letters were being watched by them.
25. The meal is always prepared by David.
26. A motorcycle was being ridden by Clare.

18. 27.Something is being written by Pat.
28. French can be spoken by him.
29. Coffee is made by her.
30. Let the plates be washed.
31. Some flowers were given by them.
32. Chess was being played by children.
33. Let the door be closed.
34. Let your clothes be ironed.
35. His son was punished by father.

19. 36. A song is being sung by Sue.
37. Picture was being painted by Diana.
38. Tennis can be played by her.
39. Two apples are always eaten by her.
40. A present was chosen by me.
41. Let the lights be turned off.
42. Let the cups be washed.
43. Let your hands be washed before eating.
44. A gold ring was bought to me by father.
45. Some cookies were given to us by Miss
Carpenter.

20. 46. What is being carried by her?
47. By whom were you given an album?
48. What was broken by John?
49. A cup of tea was made me by her.
50. A fairy tale is told children by mother.

21. Exercise. 2:
1. The books have been read (by her) for
three hours.
2. An airplane has been flown (by him) for
ten years.
3. The dentist will be seen (by them)
tomorrow.
4. Tennis will be played (by me)
5. A calculator will have been given me by
Barbara.

22. 6. French will have been taught by Miss
Barbara.
7. The milk has been spilt (by him).
8. A car has been repaired by a mechanic.
9. A little boy had been bitten by a dog.
10. A lot of money will be spent (by her).
11. He will be helped (by me).
12. Her house will be sold by Penny (by her).
13. Some postcard will be sent by Diana
tomorrow.

23. 14. Chocolate won’t be eaten (by me).
15. His grand parents will be visited (by him).
16. The table has been set (by them).
17. The newspaper had been read by John.
18. The talk show had been watched by Anne.
19. The contract will have been signed.
20. The new handbag has been bought.
21. The bicycles have been ridden by Jason
and Sue.

24. 22. A car has just been watched (by me).
23. A present has been showed me (by her).