`29.` A cake is being cut with a sharp knife by Mary.

`→` Bị động với hiện tại tiếp diễn : S + am/is/are + being VPII + (by O)

`30.` The mail is being delivered by the mailman now.

`→` Bị động với hiện tại tiếp diễn : S + am/is/are + being VPII + (by O)

`31.` The documents were being delivered to the department by Martha.

`→`Bị động với quá khứ tiếp diễn : S + was/were (not) +being + VpII + (by + O)

`32.` The palace was being designed by a French architect.

`→`Bị động với quá khứ tiếp diễn : S + was/were (not) +being + VpII + (by + O)

`33.` The report was being written by Mr Brown at 8 p.m yesterday.

`→`Bị động với quá khứ tiếp diễn : S + was/were (not) +being + VpII + (by + O)

`34.` Who were those windows being painted ?

`→`Cấu trúc : Wh-Questions + was/were + S + being VPII ?

`35.` All the workers of the place were being instructed by the chef engineer.

`→`Bị động với quá khứ tiếp diễn : S + was/were (not) +being + VpII + (by + O)

`36.` Dinner was not being eaten.

`→`Bị động với quá khứ tiếp diễn : S + was/were (not) +being + VpII + (by + O)

29. the cake is being cut with sharp knife by Mary 

30. The mail now is being delivered by the mailman

31. the documents were being delivered to the department by Martha

32. The palace was being designed by a French architect

33. The report was being written by Mr Brown at 8 p.m yesterday

34. Who were those windows being painted ?

35. all the workers of the place were being instructed by the chef engineer.

36. dinner was not being eaten by them

* cấu trúc biến đổi từ câu chủ động sang câu bị động :

- thì httd : am/ is/are + ving --> am/is/are + being + v3

 - thì qktd: was/were + v-ing -->  was/were + v3

 * trong câu bị động, trạng ngữ chỉ địa điểm đứng trước by + O, trạng ngữ chỉ thời gian đứng sau by + O