VERBOS AUXILIARES

TO HAVE: Se usa para la formación de los tiempos compuestos de pasado.

TO BE: Se usa para la forma progresiva o contínua y la voz pasiva: I am eating apples, estoy comiendo manzanas; Hamlet was written by Shakespeare, Hamlet fue escrito por Shakespeare.

DO - DID: Son auxiliares para las formas interrogativas y negativas de Presente Simple y Pasado Simple.

SHALL - WILL: a) Se usan para formar el futuro y sus pasados: shall, para las primeras personas del singular y plural; will, para las restantes; b) En la forma interrogativa Will you? equivale a ¿Quieres?

SHOULD - WOULD: Se usan para formar los condicionales: should para las primeras personas del singular y plural; would, para las restantes.

LET: Se usa para la tercera persona del singular y plural, y primera del plural del imperativo.

VERBO TO HAVE (tener, haber)

PRESENTE SIMPLE
I have
you have
he has
we have
you have
they have

PRESENTE PERFECTO
I have had
you have had
he has had
we have had
you have had
they have had

FUTURO SIMPLE
I shall have
you will have
he will have
we shall have
you will have
they will have

FUTURO PERFECTO
I shall have had
you will have had
he will have had
we shall have had
you will have had
they will have had

PASADO SIMPLE
I had
you had
he had
we had
you had
they had

PASADO PERFECTO
I had had
you had had
he had had
we had had
you had had
they had had

CONDICIONAL SIMPLE
I should have
you would have
he would have
we should have
you would have
they would have

CONDICIONAL PERFECTO
I should have had
you would have had
he would have had
we should have had
you would have had
they would have had