Question

Is he
...his room? (preposition)​

Answer 1

Answer:

in

Explanation:

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Answer 2

Is he in his room

Explanation:

A preposition is a word that connects nouns, pronouns, or phrases within a sentence.

Here we used preposition "in".

It shows the Prepositions of place.

Prepositions of Place is used to indicate the place or position of something.

prepositions "In"  is used when referring to something that is inside or within enclosed boundaries.

So the preposition for the given statement is

Is he in his room.