Sentences Expressing Existence with the Verb Haber

The present indicative form of haber is hay:

Hay dos carros rojos en la entrada.
There are two red cars in the driveway.

Hay un señor vendiendo tortillas afuera.
There is a man selling tortillas outside.

The imperfect form of haber is había:

Había muchos problemas con la casa.
There were many problems with the house.

Había un problema muy grave.
There was a serious problem.

The present subjunctive form of haber is haya:

Espero que no haya mucha gente en el partido.
I hope there aren't many people at the game.

Quiero que haya muchas bebidas en la fiesta.
I want there to be a lot of drinks at the party.

The past subjunctive form of haber is hubiera:

Yo esperaba que no hubiera tanta gente en el partido.
I was hoping that there wouldn't be so many people at the game.

Yo quería que hubiera muchas bebidas en la fiesta.
I want there to be a lot of drinks at the party.