`62` Milk is used for making butter and cheese 

`=>` Bị động thì hiện tại đơn : 

`-`  S + is / are / am + Vpp + ( by + O ) 

`63` My bike was stolen last night 

`64` Are my questions answered ? 

`65` Progress is made by her everyday in the world of science  

`65` I am wanted to buy them some new toys 

`66` A dancing class was started last week 

`=>` Bị động thì hiện tại đơn ( `62,64,65,66` )  

`(+)` S + is / are / am + Vpp + ( by + O ) 

`(-)` S + is / are / am + not + Vpp + ( by + O ) 

`(?)` Is / are / am + S +  Vpp + ( by + O ) ? 

`=>` Bị động thì quá khứ đơn ( `63`) 

`(+)` S + was / were + Vpp + ( by + O ) 

`(-)` S + was / were + not + Vpp + ( by + O ) 

`(?)` Was / were + S  + Vpp + ( by + O ) ? 

`**` Chủ ngữ như là " people , they , someone , somebody ..." khi chuyển về câu bị động ta không cần dùng " by + O "