You can use isn't instead of "is not"
Isn't = Is not
He isn't home = He is not home
He isn't in the car = He is not in the car
She isn't at the supermarket. = She is not at the supermarket
You too can use it in a sentence with going to:
She is not going to win
She isn't going to win
She's not going to win
It can help you https://www.englishclub.com/vocabulary/ ... gative.htm
This link's gonna show you all negative contractions that are possible.
I hope I helped you!