Pr.S - Tom and Sam do their homework. My elder sister writes the report. My grandmother bakes the pie.
Pr.C - Tom and Sam are doing their homework. My elder sister is writing the report. My grandmother is baking the pie.
P.S - Tom and Sam did their homework. My elder sister wrote the report. My grandmother baked the pie.
P.C - Tom and Sam were doing their homework. My elder sister were writing the report. My grandmother were baking the pie.
F.S - Tom and Sam will do their homework. My elder sister will write the report. My grandmother will bake the pie.
F.C - Tom and Sam will be doing their homework. My elder sister will be writing the report. My grandmother will be baking the pie.