This is my white shirt.
These are my white shirts.
This is my black t-shirt.
These are my black t-shirt.
This is her yellow card dress.
These are her yellow dresses.
Тhis is his red jacket.
These are his red jackets.
This is my blue hat.
These are my blue hats.
This is my red pen.
These are my red pens.
This is my brown beg.
These are my brown begs.
This is my grey computer.
These are my grey computers.
This is my pink ball.
These are my pink balls.
This is my orange pen-box.
These are my orange pen-boxes.