2) Negative sentences:
The negative of To Be can be made by adding "not" after the verb or simply "n't"
✔ We use "was not" or "wasn't" when the subject is a singular noun or the pronouns "I", "He", "She" or "It".
✔ "Were not" or "weren't" is used when the subject is a plural noun or the pronouns "We", "You" or "They".

PRONOUN | TO BE | EXAMPLE
I | was n't | I wasn't at school.
You | weren't | You weren't with us
He | wasn't | He wasn't my friend
She | wasn't | She wasn't famous
It | wasn't | It wasn't a horse
We | weren't | We weren't at the party
You | weren't | You weren't married
They | weren't | They weren't at home

Singular Noun | My friend wasn't at the office
Plural Noun | The lions weren't at the zoo

A

L

C