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The subject and verb must agree in number: both must be singular, or both must be plural. Problems occur in the present tense because one must add an -s or -es at the end of the verb when the subjects or the entity performing the action is a singular third person: he, she, it, or words for which these pronouns could substitute.I. Singular subjectSingular verbTenses1. 1. He/She/itverb1 + es/ssimple present2. 2. He/She/itis + verb-ingpresent continuous3. 3. He/She/itwas + verb-ingpast continuous4. 4. He/She/itHas/have + verb3present perfect5. 5. He/She/ithas + been + verb-ingpresent perfect continuous6. ...
