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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
youwill 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 shouldhave had
you would have had
he would have had
we should have had
you would have had
they would have had |

A 
Presente Simple
Pasado Simple
Presente Perfecto
Pasado Perfecto
Futuro Simple
Condicional Simple
Futuro Perfecto
Condicional Perfecto | FORMA INTERROGATIVA 
have I?
had I?
have I had?
had I had?
shall I have?
should I have?
shall I have had?
should I have had? | FORMANEGATIVA 
I have not
I had not
I have not had
I had not had
I shall not have
I should not have
I shall not have had
I should not have had |
MODAL VERBS ( Verbos modales ) Niveles medios y avanzado
Los verbos modales o defectivos ingleses son :

CAN Poder de habilidad o permiso

COULD Pasado de can*

MAY Poder de posibilidad, probabilidad o permiso

MIGHT Pasado de may*MUST Deber fuerte de obligación

OUGHT ( TO ) Deber de consejo (se traduce por deberías.)

USED ( TO ) Soler, una cosa que se solía hacer y ya no se hace.

NEED Tener que

SHOULD Deber de consejo ( se traduce por deberías ) 

Los verbos anómalos o defectivos ingleses se llaman así porque a diferencia de los verbos regulares o irregulares, tienen unos usos que son únicamente exclusivos a sugrupo.

1º Los verbos modales no añaden “s” en la tercera persona del singular en el presente simple.
2º No van enunciados de “to”, ni van seguidos de “to” con las excepciones de Ought y Used.
3º No usan auxiliares para formar la interrogación o negación, ya que lo forman ellos mismos.
4º No tienen pasado ni gerundio y carecen de la mayoría de los tiempos verbales.

Could se sobre entiente comopasado de Can solo en la forma negativa; Couldn´t•
Might el uso de Might implica una posibilidad muy remota y poco probable de que ocurra.

Para pedir permiso se puede usar indistintivamente Can, could, may, might.
Can y May se traducen por ¿ Puedo......?
Could y Might se traducen por ¿ Podría.......? ( mas formal y educado ) 

Apuntes especiales

Para dar consejos podemos usar tantoOught to como Should, la unica cosa que hay que tener encuenta a la hora de usarlos es que Ought siempre debe llevar "to" y Should no lo lleva.

Probabilidad o posibilidad

Si la posibilidad de que algo ocurra es del 50% usamos "May"
Si la posibilidad es inferior al 50% o poco probable de que ocurra entonces usamos "Might"
Aunque en algunos colegios se suele dar "Have to" como verbo modal,...