It is a yellow eraser
This is a black pencil.
This is a purple ruler
This is a red notebook
It is a green pencil.
It is an orange pencil case.
Is this a red notebook? No, It isn´t
Is this a green pencil? No, It isn't.
Is this a purple ruler? Yes, It is.
Is it an orange pencil case? No, It isn't.
Is it a yellow eraser? Yes, It is
Is this a black pencil? Yes, It is.