28c Use -s (or -es) endings on present-tense verbs that have third-person singular subjects.

All singular nouns (child, tree) and the pronouns he, she, and it are third-person singular; indefinite pronouns such as everyone and neither are also third-person singular. When the subject of a sentence is third-person singular, its verb has an -s or -es ending in the present tense, whether the verb is regular or irregular. (See also 22.)

	SINGULAR		PLURAL
FIRST PERSON	I	know, have, do	we	know, have, do
SECOND PERSON	you	know, have, do	you	know, have, do
THIRD PERSON	he/she/it	knows, has, does	they	know, have, do
	child	knows, has, does	parents	know, have, do
	everyone	knows, has, does

The examples read,

My neighbor (strikethrough) drive (end strikethrough) (insert) drives (end insert) to Marco Island every weekend.

Sulfur dioxide (strikethrough) turn (end strikethrough) (insert) turns (end insert) leaves yellow and (strikethrough) dissolve (end strikethrough) (insert) dissolves (end insert) marble.

Text below reads, The subjects (Italics) neighbor (End Italics) and (Italics) sulfur dioxide (End Italics) are third-person singular, so the verbs must end in (Italics) s (End Italics).

The female deer tick (strikethrough) have (end strikethrough) (insert) has (end insert) a red and brown body.

NOTE: Do not add the -s ending to the verb if the subject is not third-person singular. The writers of the following sentences added -s endings where they don’t belong.

The examples read,

I prepare (strikethrough)s (end strikethrough) system specifications for every installation.

Text below reads, The pronoun (Italics) I (End Italics) is first-person singular, so its verb does not require the (Italics) s (End Italics).

Parents do (strikethrough) es (end strikethrough have the right to excuse children from the vaccine.

Text below reads, The (Italics) s (End Italics) form is used only on present-tense verbs with third-person singular subjects.