Explain the concept of 'relative clauses of purpose' and provide examples.

Relative clauses of purpose are used to express the reason or purpose behind an action or event. They provide additional information about the purpose or intention of the subject in the main clause. These clauses are introduced by relative pronouns such as "who," "whom," "whose," "which," or "that."

Here are some examples of relative clauses of purpose:

1. I bought a new laptop that I can use for work.
- In this example, the relative clause "that I can use for work" explains the purpose of buying a new laptop.

2. She joined a yoga class to improve her flexibility, which had been a long-term goal.
- The relative clause "which had been a long-term goal" explains the purpose of joining a yoga class.

3. The company hired a consultant who could help them increase their sales.
- The relative clause "who could help them increase their sales" explains the purpose of hiring a consultant.

4. He wore a raincoat so that he wouldn't get wet in the rain.
- The relative clause "so that he wouldn't get wet in the rain" explains the purpose of wearing a raincoat.

5. We visited the museum where we could learn about ancient civilizations.
- The relative clause "where we could learn about ancient civilizations" explains the purpose of visiting the museum.

In each of these examples, the relative clause provides additional information about the purpose or intention behind the action or event mentioned in the main clause. Relative clauses of purpose help to clarify the reason behind an action or event and add depth to the overall meaning of the sentence.