I was at my Gran's house yesterday.
You were late for school this morning.
She was with her friends last Saturday.
We were tired yesterday.
I was
you were
She was
He was
It was
We were
They were
For negatives add 'n't' or ‘not’.
I wasn’t late for school this morning.
I was not late for school this morning.
She wasn’t with her friends last Saturday.
She was not with her friends last Saturday.
We weren’t tired yesterday.
We were not tired yesterday.