¡Hola!
Let's have a look at the examples:
1)
- Sorry, I couldn't come yesterday, I was a bit busy
- You couldn't have come anyway, roads were blocked because of the snowfall
2)
- I saw Maria yesterday
- You can't have seen her. She left for Bahamas three days ago
How can I express these ideas in Spanish by means of the verb poder and perfect infinitive?
Regards,
Alexander