Person and Number

There are three persons in English grammar. They are called First Person, Second Person and Third Person. But there are only two Numbers such as Singular and Plural Number.

First Person	Singular	Plural	Auxiliary Verbs
			Present	Past	Future
	I	WE	Am, is are, do, have All Modals	Was, did, had, All Modals	Shall, Will, All modals
Second Person	You	You	Are, have, All Modals	Were, Had, All Modals	Will, All Modals
Third Person	He, she, It, All Proper Nouns	They	Is, has, does, all Modals	Was, were, had, did, All Modals	Will, shall, All Modals

‘Am’ is the only auxiliary verb solely used with the Subject I in the present tense.

When any Third person singular number happens to be the subject or the doer the auxiliary or main verb takes -s after it. He goes to school everyday. She eats anything while hungry. When the verb ends with a vowel generally -es adds to it.

Like do: does. Go: goes. Eat: eats.

Thanks