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Questions & Answers about Este libro me pertenece.
Why is it este libro and not esto libro?
Why use me pertenece instead of just saying pertenece a mí?
The verb pertenecer (to belong) requires an indirect object pronoun to show who the item belongs to. Here, me acts as "to me." While you can say Este libro me pertenece a mí to add heavy emphasis ("This book belongs to me"), you can never drop the me.
Is the verb pertenecer completely regular?