把下面几个句子改为被动语态在线等谢谢~We don’t often speak English at home.They didn’t cook meals yesterday.We should obey the rules in our school.The girls often sing English songs after class.They can make this kind of machine in the fatory.The old man built a new house in front of the mountain.Did you leave your key on the desk?He will finish his new book next month.They didn’t held the sports meeting because of the heavy rain.They need 20 desks.Must we clean the roo

English isn't often spoken by us at home.
meals are not cooked yesterday by them.
rules should be obeyed in our school.
english songs are often sang by the girls after class.
this kind of machine can be made by them in the factory.
a new house was built by the old man in front of the mountain.
was your key left on the desk by you?（不一定对、、）
his new book will be finished by him next month.
the sports meeting was not held by them because of the heavy rain.
20 desks are needed by them.
must the room be cleaned by us?

1 English isn't often spoken by us at home.
2 Meals weren't cooked by them yesterday.
3 The rules should be obey by us in our school.
4 English songs are often sung by the girls after class.
5 This kind of machine can be made by them in the fadtory .
6 A new house was built by the old man in front of the mountain.
7 Was you key left by you on the desk ?
8 His new book will be finised by him next month.
9 The sports meeting wasn't held by them because of the heavy rain.
10 20 desks are needed by them.
11 Must the room be cleaned by us ?
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We don’t often speak English at home.English isn't often spoken by us at home.They didn’t cook meals yesterday.Meals weren't cooked by them yesterday.We should obey the rules in our school.The rules...