could dumb
Verbo regular: dumb - dumbed- dumbed

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

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

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

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