Student or Learner
The phrase "the room is occupied" clearly refers to the current time with "is" but appears to use the past tense with the "ed" suffix on the verb "to occupy".
What is the correct analysis of this phrase?
Language experts who have studied language for years don't stop because they have learned everything. They readily admit that they are often confounded by the complexities of language. Language is the most complicated thing a human will ever do.
Can you explain the intricacies of breathing? I doubt it but I know, because we're having this exchange, that you're still doing it well. I hope that you stay in practice for at least another 50 years.