Помогите пожалуйста поставить предложения в пасив Present S.,Pres.Cont.,Past S.,Future

Past_S
1-Tom and Sam did home work
2-My elder sister wrote a report
3-My grandmother typed a cake
Present_S
1-Tom and Sam usually do home work
2-My elder sister usually write a report
3-My grandmother often type a cake
Present_Cont 
1-Tom and Sam are doing home work
2-My elder sister is writing a report
3-My grandmother is typing a cake
Прости остольное мы еще не проходили)

1. Homework was being done by Tom and Sam.
2. Report was being written by my older sister.
3. Cake was being baked by my grandma.