=>

1. is-> was

2. will-> would

3. does it take-> it took

4. tomorrow-> the following day

5. was it-> it was

6. did he want-> he wanted

7. was she-> she was

8. did it take-> it took

9. can he-> he could

10. did-> if

11. going-> go

12. must-> had to

1. is → was 

S + said that + s + was/were +Ving +...

2. Will → would

S + told sb that + s + would + Vo + ...

3. does it take → it took

S + asked sb + how + adj + s + V ( quá khứ) + ...

4. Tomorrow → the following day

bởi vì khi chuyển từ câu trực tiếp sang gián tiếp ta phải chuyển cụm từ chỉ thời gian tomorrow-> the following day 

5. Was it → it was

S+ asked sb how + adj + S + was/ were + ...

6. Did he want → he wanted

S + asked sb + how + adj + s + V quá khứ đơn + ...

7. Was she doing → she was doing

Do you know what + S+ was/were + Ving +...

8. Did it take → it took

S + wanted to know + how + adj + S + v quá khứ đơn + ...

9. Can he →he could

S + asked sb + what + S + Could + Vo + ...

10. Did → if/ whether 

s+ asked sb + if/whether + s+ v quá khứ đơn + ...

11. Nga going → that Nga should go

s + suggested + that + S + (should) + Vo +...

12. Must → had to

S+ told sb that + S + had to + Vo +...