"He must be in the room."

"He must be inside the room."

  • Which one is correct?
  • Which preposition is suitable for this sentence?

    I think, "He must be in the room." This one is usually used.


Yes, "in the room" is more commonly used. "inside" is not wrong, but it's a longer word that adds no more meaning (at least when used in reference to a room.)

You would use "inside" as a contrast to "outside", for instance, as in the following which makes an implicit reference to a house...

A: "It's cold outside."

B: "Come in; it's warm inside."

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