Got into a dispute how to say "We are open" or "opened". And why, in this case "open" without the "`ed". How do you explain this using the grammatic terms and rules, but not at the level of personal opinion and conjecture? What parts of speech these words are? The teacher managed to say that we may also use "opened" with respect to "we are open"." I think that this is not correct. always used "open".