1.I know the boy. He can speak English well. I know the boy who/that can speak English well. 2.Mary bought a little bird. It was very pretty. Mary bought a little bird that/which was very pretty. 3.The season is summer. It comes after spring. The season is summer which/that comes after spring. 4.I know the boy. You are looking for him. I know the boy who/that you are looking for.

Change the following sentences into attributive clause.