1. Helen and Polly are friends. They (have been) friends for many years.
2. Five minutes later the teacher was in the classroom. The children (were waiting) for her.
3. They (got) married a year ago.
4. I (will try) to park the car here. I promise.
5. They are in the garden. They (have been working) there for two hours already.
6. They live in Saratov. They (have lived) there since 1998.