Dưới đây là các câu đã được viết lại theo yêu cầu:

1. **It's a pity he didn't take his doctor's advice.**
→ **He wishes he had taken his doctor's advice.**

2. **I'd like to have more time to study, but I haven't.**
→ **I wish I had more time to study.**

3. **I wish I could play tennis really well.**
→ **I'd like to play tennis really well.**

4. **I'd love to be able to go with you to the opera.**
→ **I wish I could go with you to the opera.**

5. **He just won't stop ringing me to tell me about it.**
→ **I wish he would stop ringing me to tell me about it.**

6. **I'd like Kevin to stop telling me what to do.**
→ **I wish Kevin would stop telling me what to do.**

7. **I'd love to know how John is getting on.**
→ **I wish I knew how John was getting on.**