In English 'could have' is used in the following situations:
When we talk about something that someone was able to do but didn't.
- I could have gone to Oxford University but I preferred Harvard.
- She could have married him but she didn't want to.
- They could have bought a house here 20 years ago but chose not to.
It is often used with a sense of criticism.
- You could have phoned me to let me know.
- They could have helped me instead of just sitting there.
- I could have done more to help you. Sorry.
We can use 'couldn't have' in English to talk about something we were not able to do.
- I couldn't have managed without you.
- I couldn't have got the job. He was always going to appoint his nephew.
- I couldn't have enjoyed myself more. Thank you for a lovely day.
We can use 'could have' in English also when expressing our thoughts about something that didn't happen. (In such situations we can also use 'may have' or 'might have')
- She could have taken the earlier train.
- Simon could have told her.
- They could have overheard what we said.
'Can have' is used in English also to express our thoughts about what happened, but only in questions and negative sentences, as well as in combination with words such as 'hardly', 'never' and 'only'.
- Can she have forgotten about our meeting?
- He can't have seen us.
- They can hardly have thought that I was not interested in the job.
We can use 'could have' to express our thoughts about something that didn't happen.
- You could have broken your neck, jumping out the window like that.
- He could have hurt somebody, throwing a bottle out of the window like that.
- I could have done well in my exam if I'd worked harder.
'Could have' is used in English also when talking about possible present situations that didn't happen.
- I could have been earning a lot as an accountant but the work was just too boring.
- He could have been Prime Minister now but he got involved in a big financial scandal.
- They could have been the market leaders now if they had taken his advice.
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