Question

Do we say “the door is open” or “the door is opened” and why ?

Answer 1

Depends on the context :)

Step-by-step explanation:

If the door is already open before a person comes to it, we can say that the door is open.

If the door is closed, but someone else opens it or the door opened by itself, we can say that the door is opened.

Answer 2

Step-by-step explanation:

We use the adjective 'open.' The past participle 'opened' will normally be found only in passive voice constructions, e.g. “The door is opened by electronic sensors and motors.” Now, 'unopened' is common enough, e.g