This document is a subject-verb agreement exercise that contains: 1) 20 sentences with blanks to fill in the correct verb form based on the subject. Students are asked to underline the correct verb form. 2) An additional 21 sentences with blanks to fill in the correct verb based on whether the subject is singular or plural. Students are again asked to underline the correct verb form. 3) The purpose is to practice identifying subjects and choosing the appropriate verb to maintain subject-verb agreement in sentences.