26, A lot of money is spent on advertising every day.

27, This room may be used for the classroom.

28, a story is going to be told by the teacher.

29, The cake is being cut with a sharp knife by Marry.

31, My hat is used to be pulled over my eyes.

32, All my washing has been done by hand.

33, A nest has been built by a pair of Robins since last week.

34, The murderer has not been found by the police yet.

35, One of her paintings was sold at $1000.

37, English is spoken in almost every corner of the world.

38, The machine must not be used after 5.30 p.m.

41, The wall must be cleaned before it is painted.

42, The new pupil was told where to sit.

44, I have never been treated with such kindness.

45, This story is not believed by anyone.

46, The dam may be broken by a sudden increase in water pressure.

47, Books from the library must be taken good care of.

48, I was told about it by a man I know.

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Chúc Bạn học tốt!!! Mình xin CTLHN nhé <3.

26 : people spend a lot of money on advertising everyday 

=> a lot of money is spent on advertising everyday 

bị động htđ is / am / are v3 / ed

27 : they may use this room for the classroom

=> this room may be used for the classroom

chuyển sang bị động với khuyết thiếu : giữ nguyên động từ khuyết thiếu và thêm be

28 : the teacher is going to tell a story 

=> a story is going to be told by the teacher

29 : mary is cutting the cake with a sharp knife

=> a cake is being cut with a sharp knife by mary

31 : she used to pull my hat over my eyes

=> my hat used to be pulled over my eyes

32 : i have done all my washing by hand

=> all my washing has been done by hand

33 : a pair of robins has built a nest in the porch since last week

=> a nest has been built in the porch by a pare of robins since last week

34 : the police haven't found the murderer yet

=> the murderer haven't been found by the police yet

35 : they sold one of her paintings at $1,000

=> one of her paintings were sold at $1,000

37 : people speak english in almost every corner of the world

=> english is spoken in almost every corner of the world 

38 : you mustn't use the machine after 5.30 pm

=> this machine mustn't be used after 5.30 pm

41 : you must clean the wall before you paint it

=> you are must cleaned the wall before you are painted it

42 : they told the new pupil where to sit

=> they new pupil was told where to sit

44 : nobody has ever treated me with such kindness

=> i have never been treated with such kindness

45 : no one believes this story

=> his story isn't believed 

46 : a sudden increase in water pressure may break the dam 

=> the dam may be broken by a sudden icrease in water pressure

47 : we must take good care of books borrowed from the library (tớ nghĩ câu này thiếu borrow ạa)

=> books borrowed from the library must be taken good care of

bị động must be + v3 / ed 

48 : câu này đề k đủ ạ, tớ từng làm một câu na ná vậy nên thử thôi nha

a man i know told me about it

=> i was told about it by a man i know

bị động qkd was / were + v3 / ed

nếu được thì cho tớ tlhn, 5sao và cảm ơn ạa <3