must dumb
Verbo regular: dumb - dumbed- dumbed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must dumb
you must dumb
he must dumb
we must dumb
you must dumb
they must dumb 	I must be dumbing
you must be dumbing
he must be dumbing
we must be dumbing
you must be dumbing
they must be dumbing	I must have dumbed
you must have dumbed
he must have dumbed
we must have dumbed
you must have dumbed
they must have dumbed	I must have been dumbing
you must have been dumbing
he must have been dumbing
we must have been dumbing
you must have been dumbing
they must have been dumbing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't dumb
you mustn't dumb
he mustn't dumb
we mustn't dumb
you mustn't dumb
they mustn't dumb 	I mustn't be dumbing
you mustn't be dumbing
he mustn't be dumbing
we mustn't be dumbing
you mustn't be dumbing
they mustn't be dumbing	I mustn't have dumbed
you mustn't have dumbed
he mustn't have dumbed
we mustn't have dumbed
you mustn't have dumbed
they mustn't have dumbed	I mustn't have been dumbing
you mustn't have been dumbing
he mustn't have been dumbing
we mustn't have been dumbing
you mustn't have been dumbing
they mustn't have been dumbing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I dumb?
must you dumb?
must he dumb?
must we dumb?
must you dumb?
must they dumb? 	must I be dumbing?
must you be dumbing?
must he be dumbing?
must we be dumbing?
must you be dumbing?
must they be dumbing? 	must I have dumbed?
must you have dumbed?
must he have dumbed?
must we have dumbed?
must you have dumbed?
must they have dumbed? 	must I have been dumbing?
must you have been dumbing?
must he have been dumbing?
must we have been dumbing?
must you have been dumbing?
must they have been dumbing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I dumb?
mustn't you dumb?
mustn't he dumb?
mustn't we dumb?
mustn't you dumb?
mustn't they dumb? 	mustn't I be dumbing?
mustn't you be dumbing?
mustn't he be dumbing?
mustn't we be dumbing?
mustn't you be dumbing?
mustn't they be dumbing? 	mustn't I have dumbed?
mustn't you have dumbed?
mustn't he have dumbed?
mustn't we have dumbed?
mustn't you have dumbed?
mustn't they have dumbed? 	mustn't I have been dumbing?
mustn't you have been dumbing?
mustn't he have been dumbing?
mustn't we have been dumbing?
mustn't you have been dumbing?
mustn't they have been dumbing?