1.The woman who/that bought the red car is an old friend of my husband's.
2. Those books which/that you bought are boring.
3. My husband said that she's an excellent driver, which is quite true.
4. They didn't know what to call the dog; it was their daughter that /who came up with the name Trigger.
5. The dog that/which lived nexdoor when I was a child was also called Trigger.
6. A retired woman, who happens to be my old teacher, has bought that house.