"Casas" is a form of "casar", a transitive verb which is often translated as "to marry". "Edificio" is a noun which is often translated as "building". Learn more about the difference between "edificio" and "casas" below.
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
1. (to join in marriage)
2. (to give in marriage)
3. (to join)
An intransitive verb is one that does not require a direct object (e.g. The man sneezed.).
4. (to marry; used with "con")
5. (to match together)
6. (to be harmonious)
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A reciprocal verb is a verb that indicates that two or more subjects perform an action on each other (e.g. Ellos se abrazan.).