Some background.

Some of the organization of our language.

First, second, and third person.  Start with pronouns and self!

I  you  he/she/it

The verbs are arranged both by 'person' and by tense (time) -- you probably have heard of conjugating verbs.

Simple present will give you an easy example

Singular: first, second, third -- I walk, you walk, he/she/it walks

Plural: first second third -- we walk, you walk, they walk

You know that an S is added to make a (regular) plural for a noun -- dog, dogs.

You see above that for the verb, S is added to the singular.

 

It's important to know the function of a pronoun as a subject or an object.

As a subject you say: You and I are going to the store.

As object, Jane is coming with me; Jane is coming with you and me.

> As subject (of the verb)

am the first person

        =  who'd disagree?  :-)

are the second person

        =  I'm talking with you!

        =  was thou with plural ye; having you as singular and plural somewhat cripples English, alas (see plural below)

is the third person

        =  note third person masculine is considered the 'neutral' -- but don't tell him (and them)...........

>As object (of the verb, of the preposition):

1

just think of the kids:  "Johnny hit me!" (object of the verb)

object of prepositions with and to: Mary, please come with me; give the parcel to me.

=  some misunderstand function; see more in section on I/me below)

2

=  pretty easy; overused?  never changes! (cuz we don't use thee any more)

3

=  as appropriate!

(the dog bit him! she took the dog with her;  the store is close to it)

2  you  (what else?)

1

s (I):  This is my pencil

pl (we):  our pencils

2

it's not your pencil

.....your pencils

3

His pencils are blue, her pencils are red; the dog was wagging its tail

Their pencils are in the other box.

Some people think they're being more polite or fancy if they avoid using I but they then use a reflexive pronoun which is to be used to 'reflect' on the subject as in:

1

I helped myself.  We helped ourselves.

2

You yourself can drive.  You yourselves can drive.

3

He washed himself off; she herself cleaned up; it hurt itself on the trampoline;

they caught themselves in time.

Remember that if you use the reflexive pronoun, myself (or herself) for example, you have to have used I (or she) first.

Well, I got sidetracked, didn't I.

Correct:

for/with you and me (NOT myself)

As for me, ..... (NOT myself)

I'm fine, and you? (NOT yourself)