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"Its own" is a phrase which is often translated as "su propio", and "their" is an adjective which is often translated as "su". Learn more about the difference between "its own" and "their" below.
its own()
A phrase is a group of words commonly used together (e.g., once upon a time).
their()
An adjective is a word that describes a noun (e.g., the big dog).
1. (possessive)
