The Spanish equivalent for there + be expression, usually used when the subject of the verb to be is an indefinite person or thing, is the 3rd singular person of the verb haber.
In Spanish, this is an impersonal clause. That is to say, there is no subject. As the verb in Spanish agrees with the subject, there is no agreement. The noun that follows the verb is a direct object (DO), that can be replaced by a pronoun. English speakers must be very careful because in English there is agreement. Examples with audio are given to ease this explanation.
Hay un coche rojo en la calle.
There is a red car in the street.
Hay tres coches en la calle.
There are three cars in the street.
Había muchos niños jugando.
There were many children playing.
Había una toalla en el baño.
There was a towel in the bathroom.
Había dos toallas en el baño.
There were two towels in the bathroom.
Ha habido un terremoto.
There has been an earthquake.
Ha habido algunos terremotos.
There have been some earthquakes.
Listen and repeat: