Grade 7 English Language and Arts - Skill Builder + New York State Test (NYST) Rehearsal To be...and other verbals

Grade 7 English Language and Arts - Skill Builder + New York State Test (NYST) Rehearsal To be...and other verbals

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What is the grammar error present in the underlined portion of the following sentence?

He thinks he is able to quickly go to the store and return before his mother gets home.