chuyển sang bị động

11.They must hand in weaponds

12.You must wash this sweater in warm water

13 You should buy that new house

14 Noone can lift these heavy bags

15 Hai must water the trees in the garden

16 They will invite her to the party

17 Can you open this box?

18 Does he have to clean the floor ?

19 Minh should drink milk before going to bed

20 Noone can answer my questions

11. Their weapons must be handed in.

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).

12. This sweater must be washed in warm water.

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).

13. New house should be bought.

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).

14. These heavy bags can't be lifted.

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).

15. The trees in the garden must be watered by Hai.

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).

16. She will be invited to the party.

`-` BD `-` TLĐ : S + will + be + Ved / V3 + ( by O ).

17. Can this box be opened`?`

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).

18. Are the floor had to cleaned`?`

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).

19. Milk should be drank by Minh before going to bed.

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).

20. My questions can't be answer.

`-` BD `-` ĐTKT : S + ĐTKT ( must, should, can, may, ... ) + be + Ved / V3 + ( by O ).