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Not feeling ready yet? These can help:
Skill IconQQ.6Use regular plurals with -s, -es, and -ies
Skill IconVV.1Use the correct article: a or an
Skill IconJJ.3Use the correct homophone
Skill IconQQ.11Identify and correct errors with plural and possessive nouns
Skill IconZZ.1Pronoun-verb contractions
Skill IconZZ.2Contractions with "not"