1. Use when, before, or after, the past perfect, and the past simple to join the sentences.

2. When she had studied for four years, she got a degree in Engineering. / She got a degree in Engineering after she had studied for four years.
3. After he had worked as a sales assistant, he got a new job as a car salesman. / When he had worked as a sales assistant, he got a new job as a car salesman.
4. Ann and David got married after they had been engaged for five months. / When Ann and David had been engaged for five months, they got married.
5. Mr. Harris went to hospital after he had been sick for many weeks. / When Mr. Harris had been sick for many weeks, he went to hospital.