chuyển các câu sau sang câu bị động
51,Don't talk in this class .
52,She is going to punish that student.
53,They began building a new bridge.
54,We painted the door green.
55,It's expected that the strike will end soon.
56,Is he feeding the dog?
57,She made the pretty dolls.
58,This little boy called the doctor .
59,They will have finoshed their homework by time o'clock.
60,We have hired the bus.
61,Were they looking after the children.
62,She will sing this song.
63,They think I am lazy.
64,My father has signed the form.
65,The man is chopping down the tree