=> 
17. Why wasn’t he helped?
18. How many games have been played by the team?
19. Where is English spoken?
20. Who are being kept in the kitchen?
21. How can this be opened safe?
22. What books are being read this year?
23. How was the lost man found by the police?
24. By whom are the children looked after for you?
25. How long has the doctor been waited for?

26. What time can their papers be handed in by the boys?
27. By whom is this book lent?
28. How many marks are given to you by the teacher?

Đây là dạng câu bị động nhé.

$\text{⇒ Answer:}$

$\text{17. Why didn't they help him?}$

$\text{→ Why wasn’t he helped?}$

$\text{18. How many games has the team played?}$

$\text{→ How many games have been played by the team?}$

$\text{19. Where do people speak English?}$

$\text{→ Where is English spoken?}$

$\text{20. Who are they keeping in the kitchen?}$

$\text{→ Who are being kept in the kitchen?}$

$\text{21. How can they open this safe?}$

$\text{→ How can this be opened safe?}$

$\text{22. What books are people reading this year?}$

$\text{→ What books are being read this year?}$

$\text{23. How did the police find the lost man?}$

$\text{→ How was the lost man found by the police?}$

$\text{24. Who look after the children for you?}$

$\text{→ By whom are the children looked after for you?}$

$\text{25. How long have they waited for thedoctor?}$

$\text{→ How long has the doctor been waited for?}$

$\text{26. What time can the boys hand in their papers?}$

$\text{→ What time can their papers be handed in by the boys?}$

$\text{27. Who lend you this book?}$

$\text{→ By whom is this book lent?}$

$\text{28. How many marks does the teacher give you?}$

$\text{→ How many marks are given to you by the teacher?}$