Open vs opened in English

The door is open or opened. Which word should be used after the linking verb? Many students don't know the difference and use it interchangeably.

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Title page, Seplasium . English: Title page from Seplasium. The compleat English physician : or, The druggist's shop opened. Explicating all the particulars of which medicines at this day are composed and

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Solved 3-33. The trunk of an automobile is opened in one of

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Opened English Dictionary stock photo. Image of paper - 37614170

Open vs Opened: When To Use Each One In Writing

How do you say the door is 'open'. Why not 'opened'? = the door is 'closed'. in English (US)?

What is the difference between 'open' and ' is opened' ? - Blog