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
he could den
we could den
you could den
they could den 	I could be dening
you could be dening
he could be dening
we could be dening
you could be dening
they could be dening	I could have dened
you could have dened
he 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
he 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 couldn't den
you couldn't den
he couldn't den
we couldn't den
you couldn't den
they couldn't den 	I couldn't be dening
you couldn't be dening
he couldn't be dening
we couldn't be dening
you couldn't be dening
they couldn't be dening	I couldn't have dened
you couldn't have dened
he couldn't have dened
we couldn't have dened
you couldn't have dened
they couldn't have dened	I couldn't have been dening
you couldn't have been dening
he couldn't have been dening
we couldn't have been dening
you couldn't have been dening
they couldn't have been dening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I den?
could you den?
could he den?
could we den?
could you den?
could they den? 	could I be dening?
could you be dening?
could he be dening?
could we be dening?
could you be dening?
could they be dening? 	could I have dened?
could you have dened?
could he 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 he 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 	
couldn't I den?
couldn't you den?
couldn't he den?
couldn't we den?
couldn't you den?
couldn't they den? 	couldn't I be dening?
couldn't you be dening?
couldn't he be dening?
couldn't we be dening?
couldn't you be dening?
couldn't they be dening? 	couldn't I have dened?
couldn't you have dened?
couldn't he have dened?
couldn't we have dened?
couldn't you have dened?
couldn't they have dened? 	couldn't I have been dening?
couldn't you have been dening?
couldn't he have been dening?
couldn't we have been dening?
couldn't you have been dening?
couldn't they have been dening?