could den
Verbo regular: den - dened- dened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could den
you could den
she could den
we could den
you could den
they could den 	I could be dening
you could be dening
she could be dening
we could be dening
you could be dening
they could be dening	I could have dened
you could have dened
she could have dened
we could have dened
you could have dened
they could have dened	I could have been dening
you could have been dening
she could have been dening
we could have been dening
you could have been dening
they could have been dening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not den
you could not den
she could not den
we could not den
you could not den
they could not den 	I could not be dening
you could not be dening
she could not be dening
we could not be dening
you could not be dening
they could not be dening	I could not have dened
you could not have dened
she could not have dened
we could not have dened
you could not have dened
they could not have dened	I could not have been dening
you could not have been dening
she could not have been dening
we could not have been dening
you could not have been dening
they could not have been dening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I den?
could you den?
could she den?
could we den?
could you den?
could they den? 	could I be dening?
could you be dening?
could she be dening?
could we be dening?
could you be dening?
could they be dening? 	could I have dened?
could you have dened?
could she have dened?
could we have dened?
could you have dened?
could they have dened? 	could I have been dening?
could you have been dening?
could she have been dening?
could we have been dening?
could you have been dening?
could they have been dening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not den?
could you not den?
could she not den?
could we not den?
could you not den?
could they not den? 	could I not be dening?
could you not be dening?
could she not be dening?
could we not be dening?
could you not be dening?
could they not be dening? 	could I not have dened?
could you not have dened?
could she not have dened?
could we not have dened?
could you not have dened?
could they not have dened? 	could I not have been dening?
could you not have been dening?
could she not have been dening?
could we not have been dening?
could you not have been dening?
could they not have been dening?