Use this checklist as a list of reminders while you are editing your paper.
6. Incorrect pronoun case
Determine whether the pronoun is being used as a subject, or an object, or a possessive in the sentence, and select the pronoun form to match.
Incorrect:
Castro's communist principles inevitably led to an ideological conflict between he and President Kennedy.
Correct:
Castro's communist principles inevitably led to an ideological conflict between him and President Kennedy.
Incorrect:
Because strict constructionists recommend fidelity to the Constitution as written, no one objects more than them to judicial reinterpretation.
Correct:
Because strict constructionists recommend fidelity to the Constitution as written, no one objects more than they [do] to judicial reinterpretation.