Use of Could Have:
Could have" is a modal verb used to talk about something that was or wasn't possible in the past. For example, "I could have purchased a car".
Here are some more examples of "could have" in use:- You could have done your homework.
- He could have brought his pen.
- He could have worked hard to get good marks.
- You could have purchased a mobile phone.
- We could have helped him.
- They could have followed the rules.