1. – What are you doing?
– I'm repairing my son's bicycle. I (do) it for two hours.

2. I'll call for an ambulance. She (get) weaker and weaker since she had breakfast.

3. Hurry up, John. I'm waiting for you. You (have a bath) for an hour.

4. Who is that man standing on the comer? He (stand) there for the last half an hour.

5. Where is Dad? I (wait) for him since 6 p.m. We are going to be late to the concert.

6. I can't stand it any more. Those people (quarrel) since breakfast.

7. – Jim works as a sales manager.
– Really?
– He (sell) washing machines for three months.

8. Dora is playing the piano. She (play) the piano since I came.

9. Aren't you going to tell me what (you / do) in my absence?

10. How long you (sit) here?

11. Michael, I (try) to get you all day!

12. I'll go and wash my eyes. I don't want my husband to see I (cry).

13. The amount of crime (increase) for the last ten years and we can't stop this process.