Concord in the use of English language means agreement between the subject and the verb or agreement
between a verb and other elements of clause structure.
In the use of concord in English language, there are many rules governing the topic.
So let's analyse the rules one by one.
Subject and verb concord
When the subject in a sentence is singular, the verb should also be singular.
She (singular subject) goes (singular verb), not: She go ( plural verb). Also, when the subject is plural,
the verb should also be plural.