must sink
Verbo irregular: sink - sank, sunk- sunk

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must sink
you must sink
he must sink
we must sink
you must sink
they must sink 	I must be sinking
you must be sinking
he must be sinking
we must be sinking
you must be sinking
they must be sinking	I must have sunk
you must have sunk
he must have sunk
we must have sunk
you must have sunk
they must have sunk	I must have been sinking
you must have been sinking
he must have been sinking
we must have been sinking
you must have been sinking
they must have been sinking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't sink
you mustn't sink
he mustn't sink
we mustn't sink
you mustn't sink
they mustn't sink 	I mustn't be sinking
you mustn't be sinking
he mustn't be sinking
we mustn't be sinking
you mustn't be sinking
they mustn't be sinking	I mustn't have sunk
you mustn't have sunk
he mustn't have sunk
we mustn't have sunk
you mustn't have sunk
they mustn't have sunk	I mustn't have been sinking
you mustn't have been sinking
he mustn't have been sinking
we mustn't have been sinking
you mustn't have been sinking
they mustn't have been sinking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I sink?
must you sink?
must he sink?
must we sink?
must you sink?
must they sink? 	must I be sinking?
must you be sinking?
must he be sinking?
must we be sinking?
must you be sinking?
must they be sinking? 	must I have sunk?
must you have sunk?
must he have sunk?
must we have sunk?
must you have sunk?
must they have sunk? 	must I have been sinking?
must you have been sinking?
must he have been sinking?
must we have been sinking?
must you have been sinking?
must they have been sinking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I sink?
mustn't you sink?
mustn't he sink?
mustn't we sink?
mustn't you sink?
mustn't they sink? 	mustn't I be sinking?
mustn't you be sinking?
mustn't he be sinking?
mustn't we be sinking?
mustn't you be sinking?
mustn't they be sinking? 	mustn't I have sunk?
mustn't you have sunk?
mustn't he have sunk?
mustn't we have sunk?
mustn't you have sunk?
mustn't they have sunk? 	mustn't I have been sinking?
mustn't you have been sinking?
mustn't he have been sinking?
mustn't we have been sinking?
mustn't you have been sinking?
mustn't they have been sinking?