a) With a noun

b) Without a noun

This is my house.

No, it's mine.

Is this your bike?

No, it's yours.

This is his book.

Yes, it's his.

Her pullover is green.

No, hers is brown.

Here is its ball.

Yes, it's its.

We like our dog.

This dog is ours.

Is this your car?

Yes, it's yours.

This is their telephone.

No, it isn't theirs.

EXERCISE 1

EXERCISE 2

EXERCISE 3

EXERCISE 4

EXERCISE 5

EXERCISE 6