Spanish language Q&A Forum

¡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