Pronoun

Missing a pronoun or relative pronoun; unclear pronoun reference or wrong use of a pronoun. Missing relative pronoun The relative pronouns (e.g. “who”, “which”, “that”, “whom”) cannot be omitted when they are the subject of the relative clause. It is okay to omit the relative pronoun when

Agreement

Agreement errors include problems with subject-verb agreement, modals followed by a main verb and determiners. The subject and the verb in the same sentence should agree in person and number. Modals should be followed by a bare infinitive. In a noun phrase, the determiner should agree with the