Concord

Concord, also known as agreement, refers to the need, or not, for words in the same sentence to relate to each other, grammatically, i.e. in number, gender, person or case.

It can apply to the following:
 * a) a subject and its verb; President Bill Clinton, State of the Union Address, 23 Jan. 1996. should be: "Every one of us has a role to play ..."
 * b) a noun and its pronoun;  J.M. Balkin, "Turandot's Victory", 2 Yale J. Law & Humanities 299, 302 (1990) should be: "You can only teach a person something if that person can comprehend and use what is being taught."
 * c) a subject and its complement;
 * d) a noun and its appositive;
 * e) a relative pronoun and its antecedent;
 * f) an adjective and its noun.