Third-person singular -s: A common mistake (most often made by ESL speakers) is to omit
the final -s from verbs that should agree in number with third-person, singular, present tense nouns.
For example (in present tense)

            (first person)                I                 walk         (no -s)
            (second person)         you               walk         (no -s)
            (third person)          he, she or it      walks      (add -s)

            He walks to work and leaves his car at home.

Mistakes in number are specially likely to occur when you are confused about which noun the verb
agrees with. Sometimes this confusion occurs because there is a phrase between the noun and verb.

                                         prepositional phrase
        A golf club (singular)      in Tiger Wood's hands        behaves (singular)    like a magic wand.

The verb behaves (singular) agrees in number with its subject golf club (singular) not with the closest
noun hands. Trouble can also occur when the verb is in a modifying clause.

                                                adjective clause
        Any player (singular)    who wins (singular) a championship        is (singular) both lucky and skilled.

Win, the verb in the adjective clause, agrees in number with the noun player. Remember that adding an
-s to a verb doesn't make it plural. We add -s to a verb to make it agree with a third-person, singular,
noun.

Special Properties of Certain Verbs: The verbs make, do, let and verbs of the senses, such as see and hear, make the -s in verbs that follow them disappear. For example, [WITHOUT LET] My brother borrows my car; [WITH LET] I let my brother borrow [no -s] my car.

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