III. Change the following sentences from the active into the passive.

`21.` Dinner is being prepared by my mother at the moment.

`-` DHNB`:` at the moment `->` Thì hiện tại tiếp diễn

`22.` Products with poor quality won't be bought.

`-` No one: Không ai (mang nghĩa phủ định)

`-` buy - bought - bought: mua

`23.` Your dog will not be allowed to enter the museum (by them).

`24.` Has Jim and Jane’s luxury wedding been heard of?

`25.` The computers are being used to look up information by the boys.

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Bị động:

`-` Thì hiện tại tiếp diễn: S + am/ is/ are + being + V(pp) + (by O).

`-` Thì tương lai đơn:

$(+)$ S + will + be + V(pp) + (by O).

$(-)$ S + will not/ won't + be + V(pp) + (by O).

`-` Thì hiện tại hoàn thành: $(?)$ Have/ Has + S + been + V(pp) + (by O)?

21. Dinner is being prepared by my mother at the moment

22. Products will be bought with poor quality

23. Your dog won't be allowed to enter the museum by them

24. Have Jim and Jane's luxury wedding been heard by any one?

25. The computers are being used to look up information by the boys