Subject Verb Agreement
Here are some links for you to practice the grammar rules
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise1.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise2.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise3.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise4.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise5.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise6.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise7.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise8.aspx
quiz : http://grammar.ccc.commnet.edu/grammar/quizzes/svagr2.htm
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise2.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise3.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise4.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise5.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise6.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise7.aspx
https://webapps.towson.edu/ows/SelfTeachingUnits/SubjectVerbAgreementExercise8.aspx
quiz : http://grammar.ccc.commnet.edu/grammar/quizzes/svagr2.htm