1. I have a friend. Her mum is a volunteer worker.

`->` I have a friend whose mum is a volunteer worker.

2. It is a camping shop. It has a lot of good equipment.

`->` It is a camping shop which has a lot of good equipments.
 

 She is the most intelligent woman. I’ve ever met this woman.

⇒ She is the most intelligent woman whom I’ve ever met .

2. This doctor is famous. You visited him yesterday.

⇒ This doctor, whom you visited yesterday, is famous.

3. These children are orphans. She is taking care of these children.

⇒ These children, whom she is taking care of, are orphans.