24. I don't know what should I do tonight?

--> What + tro dong tu + V-inf?

25. I have no idea when should we go to school again after COVID 19 pandemic?

--> When + tro dong tu should + V-inf?

26. How could he see her again?

--> How + tro dong tu could + V-inf?

27. How can she earn a lot of money?

--> How + tro dong tu can + V-inf?

28. Nam wondered what should he do then

--> S + wonder + tu de hoi + S + V

29. Lan wondered how can they open that door

--> S + wonder + tu de hoi + S + V

30. Hoa couldn't decide whether she could buy flowers or not ( chi ko chac lam nha :(( )

31. They wondered whether they should buy a fridge for their parents

--> S + wondered + whether/if + S + V

32. Nga wondered if she should ask her teacher for help 

-->S + wondered + whether/if + S + V