Formas del verbo IMPERSONAL: haber (there to be)

Formas del verbo IMPERSONAL:  haber (there to be) 
[Irregular en el presente de indicativo (hay), el presente de subjuntivo (haya), el pretérito (hubo, radical fuerte) y el futuro/condicional (habrá/habría).]

Indicativo
	English	yo	tú	[IMPERSONAL]	nosotros, -as	vosotros, -as	Uds./ellos/ellas
Presente	there is, are			hay
Futuro	there will be			habrá
Imperfecto	there was, were, used to be			había
Pretérito	there was, were			hubo
Condicional	there would be			habría
Presente perfecto	there has been, have been			ha habido
Futuro perfecto	there will have been			habrá habido
Pluscuamperfecto	there had been			había habido
Pretérito anterior1	there had been			hubo habido
Condicional perfecto	there would have been			habría habido
Subjuntivo
Presente	there is, are, be; let there be, may there be			haya
Imperfecto2	there was, were			hubiera
Futuro1	there will be			hubiere
Presente perfecto	there have been, were			haya habido
Futuro perfecto1	there will have been			hubiere habido
Pluscuamperfecto3	there had been			hubiera habido
Imperativo
		Afirmativo			Negativo
Tú
Vosotros, -as
Usted
Ustedes
IMPERSONAL	let there be, may there be	haya			no haya
Otras formas
Gerundio	there being	habiendo
Participio pasado	(there) been	habido

¹ Tiempo arcaico.
² O: hubiese.
³ O: hubiese habido.



fuente :  http://users.ipfw.edu/jehle/courses/verbs/HABER.HTM