Hi,<br/>Which should be the tenses for this?<br/><br/>You should have told us you couldn't be at our birthday party if you knew (know??) you couldn't (can't??) attend it.<br/><br/>I think we can talk about the current capacity with the action in the past like this.<br/><br/>If you spoke English, you could have gotten the job a few weeks ago.<br/>If you were rich, you could have bought that Porche you saw two days ago.