There is
Hay singular
There are
Hay plural
There will be
Habrá
There was
Hubo había sing
There were
Hubo, había plu
There has been
Ha habido sing
There have been
Ha habido plu
There had been
Había habido sing
There would have been
Hubiera habido
There should have been
Deberia haber habido
There could have been
Podría haber habido