Past Tense:
Have - Had
She eats - She ate
It is - It was
We give - We gave
He finishes - He finished
You write - You wrote
We have - We had
It takes - It took
I show - I showed (shown is often used with the helping verb of 'have')
Past Tense Sentences:
Caleb saw the new Jenny Pond film.
I did my best. (Or perhaps 'I had done my best?')
Negatives:
You've got no chance of losing.
The aliens can't find anywhere to land.
Barry doesn't think anyone will come.
The lads don't have anything to be afraid of.
Ivan has three sweets but Drew has none.
Arthur and Merlin don't need help.
Ain't:
Abdul wants some sweets bit Gillian doesn't have any.
The Johnsons don't have any pets.
Hopefully this helps! :)