Depending on exactly how and where the word is being used:
Dentro
Adentro
come inside = ¡Pase por favor!
As "inside" is "dentro."
I place inside
The only way for you to get inside of spanish schools is visiting the related link below.
persona beya
dentro de la boca.
Spanish soldiers guarded the missions and made sure none of the Native Americans inside ran away or revolted.
It would depend on the context, but if it were being used as an adjective or adverb then it would mean "inside", but if you were using it as a preposition then it would mean "via" or "within".
"Muros" are outside walls, "paredes" are inside walls.
Adentro / en el interior / interior / dentro...
potato ball
"En mi" in Spanish means "in me" or "in my." It is used to indicate possession or location, similar to the English phrases "in my" or "inside me."