1. I regretted having sold my motorbike.
-> If…
2. In spite of working until very late, I didn’t feel tired.
-> Despite the…
3. We failed to find the cause of the accident.
-> We didn’t…
4. It looks as if it’s going to rain.
-> It’s likely…
5. You ought to write down what you understand now.
-> It’s time…
1. If only I hadn’t sold my motorbike.
2. Despite the fact that I worked very late, I didn’t feel tired.
3. We didn’t find out the cause of the problem.
4. It’s likely to rain.
5. It’s time you wrote down what you understand.