1. I have worked on this problem for two months (P.Pr.).
2. She hasn't been on this problem yet (P.Pr.Con.)
3. I have never slept outside (P.Pr.).
4. She has been sleeping all this time (P.Pr.Con.).
5. I haven't slept well for month (P.Pr.).
6. I have been waiting for you for ages (P.Pr.Con.).
7. We waited herе for 40 minutes (P.Pr.).
8. I have been cleaning all morning, I'm fed up! (P Pr.Con.)
9. Have you already cleaned your room, Jake? (P.Pr.)
10. Lisa has never drunk orange juice. She is allergic to citrus fruit. (P.Pr.)
11. I have been drinking more water recently, and I feel better. (P.Pr.Con.)
12. The students have finished their exams. They're very happy. (P.Pr.)
1. I have worked on this problem for two months (P.Pr.).
2. She hasn't been on this problem yet (P.Pr.Con.)
3. I have never slept outside (P.Pr.).
4. She has been sleeping all this time (P.Pr.Con.).
5. I haven't slept well for month (P.Pr.).
6. I have been waiting for you for ages (P.Pr.Con.).
7. We waited herе for 40 minutes (P.Pr.).
8. I have been cleaning all morning, I'm fed up! (P Pr.Con.)
9. Have you already cleaned your room, Jake? (P.Pr.)
10. Lisa has never drunk orange juice. She is allergic to citrus fruit. (P.Pr.)
11. I have been drinking more water recently, and I feel better. (P.Pr.Con.)
12. The students have finished their exams. They're very happy. (P.Pr.)