1. These things belong to my husband. → They are his.
2. This coat belongs to me. → It is mine.
3. These shoes belong to my wife. → They are hers.
4. These books belong to my brother and me. → They are ours.
5. These pens belong to Tom and Jill. → The pens are theirs.
6. This suitcase belongs to you. → It is yours.

Are these their keys? = Are these keys theirs?

• Do these keys belong to them?

Is this your letter? = Is this letter yours?

• Does this letter belong to you?