Exercise 2. Combine each pair of sentences, using a relative clause. 1. I have a friend. Her mum is a volunteer worker. → I have a friend whose mum is a volunteer worker. 2. The rescue operation was arranged by a charity organisation. It was a success. → 3. My uncle is a fire fighter. He visited us last weekend. → 4. The storm started at 2 o’clock this morning. It caused a lot of damage. → 5. Nick is my classmate. I’ve known him for a long time. → 6. There are about one billion people. They use English as the lingua franca of international communication. -> 7. Differences between languages can cause some problems to learners. Differences between languages are explained in course books. ->

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