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Indoors because if it is raining outdoors you can just have recess
indoors
Usually indoors.
No, it is not a preposition. The word indoors is an adverb.
Yes, indoors is an adverb.
Example: The children played indoors.
Adverbs often answer the questions where? when? how? Where did the children play? Indoors.
Zagreb Indoors was created in 1996.