This/these/that/those

This is a cat.

That is a cat.

Those is a cat.

This is chairs.

These is chairs.

These are chairs.

That are pencil cases.

Those is pencil cases.

Those are pencil cases.

That is a car.

Those are cars.

This is a car.

Those are three dogs.

That are two dogs.

Those are two dogs.

These are a pen.

This is a pen.

These is a pen.

These are dolls.

That are dolls.

Those are dolls.