There (be) = haber
se forma utilizando "there" + la forma correspondiente del verbo "to be".
(presente)
Hay = there is /are
Hay dos personas hablando
There are two persons speaking
There are NOT two persons speaking
Are there two persons speaking?
Hay un libro sobre la mesa
There is a book on the table
There is NOT a book on the table
Is there a book on the table?
(pasado)
Había/hubo = there was/were
Hubo un libro sobre la mesa
There was a book on the table
There was NOT a book on the table
Was there a book on the table?
Había unos libros sobre la mesa
There were some books on the table
There were NOT ANY books on the table
Were there ANY books on the table?
(futuro)
Habrá = there will be
Habrá un terremoto
There will be an earthquake
There will NOT be an earthquake
Will there be an earthquake?