“Is” and “are” are linking verbs used to show the state or existence of the subject in a sentence. “Is” is used when the subject is singular (one), while “are” is used when the subject is plural (more than one).In the sentence “There ___ learners inside the library”, the subject is “learners”. Since “learners” is plural, we cannot use “is”. The correct verb is “are”, so the complete sentence is: “There are learners inside the library.”