inside    imbere
(~ the kraal) intangāro
(to be inside) kubamwo
En-En dictionary 
kubamwo (-yemwo)   v    to be inside
mu     prep    1. in, into, 2. during, 3. out of (the inside of a thing, e.g. kuva mu muriro – to come out of the fire)
imbere     prep    before, inside, in front of
mw   prep    1. in, into, 2. during, 3. out of the inside, (form of mu before fifth class nouns in singular, e.g. mw ishuli - in school)
wall    ikibambāzi, umukīngo, uruhome
(inside house) urusīka, igisīka
(surrounding) uruzitiro
(to ~) kuzitira
En-En dictionary 
 inside found in: Kirundi I (Study lessons)
lesson 5   Mu and Ku
lesson 118   Some Adverbs; The –raca– Tense