A.(Is )this your ruler,Mary?
B.(What )(colour )is it?
A.It's red
B.No,it isn't my ruler.My ruler( is)yellow
A.(Whose )ruler is it?
B.I think it's Tom's.You can ask him
A.(Is )this your ruler,Mary?
B.(What )(colour )is it?
A.It's red
B.No,it isn't my ruler.My ruler( is)yellow
A.(Whose )ruler is it?
B.I think it's Tom's.You can ask him