THERE IS, THERE ARE...

there (be) = HABER

there is a book here = hay un libro aquí.

there are 5 books here

* se sigue la conjugación del "to be"

I AM

I WAS

I WILL BE

THERE IS A BOOK = hay un libro

THERE WAS A BOOK = había/hubo un libro

THERE WILL BE A BOOK = habrá un libro