Subject-Verb Agreement

When speaking or writing English the subject must agree with the verb.
Singular nouns require singular verbs.
Plural nouns require plural verbs.
A very general rule of thumb to follow:  When the subject ends in "s" the verb will no; but when the subject DOES NOT end in "s" the verb will.
EXAMPLE:  The man plays video games all night.
Subject: "man" (singular)   Verb: "plays" (singular)    I play; you play; he(man), she, it plays
EXAMPLE:  The men play video games all night.
Subject: "men" (plural)   Verb  "play" (plural)         We play, you play, they play