TO BE PAST TENSE
I'm a bit tired.
He was late last time too.
The journey was fantastic.
My brother isn't very tall.
Here are examples with nouns or noun phrases:
She was an English teacher for years.
They're both teachers at our school.
That's my laptop.
And here are examples with adverb and preposition phrases:
I'm here at the café, and you're not!
Are you there yet?
Your phone's in my bag.
Where were you a 5 o'Clock?