Chuyển sang câu bị động

   chuyển sang câu bị động giúp
1, mr snow hasn"t taught the  course since 2008

2, does she divide the students into four groups? yes, she does 

3, where did you put the key  yesterday?

4,  who are you looking for ?

5, who has taken my bag away?

7, when will she hold the party?

8, won"t you tell him the truth? yes, I will