could preen
Verbo regular: preen - preened- preened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could preen
you could preen
she could preen
we could preen
you could preen
they could preen 	I could be preening
you could be preening
she could be preening
we could be preening
you could be preening
they could be preening	I could have preened
you could have preened
she could have preened
we could have preened
you could have preened
they could have preened	I could have been preening
you could have been preening
she could have been preening
we could have been preening
you could have been preening
they could have been preening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not preen
you could not preen
she could not preen
we could not preen
you could not preen
they could not preen 	I could not be preening
you could not be preening
she could not be preening
we could not be preening
you could not be preening
they could not be preening	I could not have preened
you could not have preened
she could not have preened
we could not have preened
you could not have preened
they could not have preened	I could not have been preening
you could not have been preening
she could not have been preening
we could not have been preening
you could not have been preening
they could not have been preening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I preen?
could you preen?
could she preen?
could we preen?
could you preen?
could they preen? 	could I be preening?
could you be preening?
could she be preening?
could we be preening?
could you be preening?
could they be preening? 	could I have preened?
could you have preened?
could she have preened?
could we have preened?
could you have preened?
could they have preened? 	could I have been preening?
could you have been preening?
could she have been preening?
could we have been preening?
could you have been preening?
could they have been preening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not preen?
could you not preen?
could she not preen?
could we not preen?
could you not preen?
could they not preen? 	could I not be preening?
could you not be preening?
could she not be preening?
could we not be preening?
could you not be preening?
could they not be preening? 	could I not have preened?
could you not have preened?
could she not have preened?
could we not have preened?
could you not have preened?
could they not have preened? 	could I not have been preening?
could you not have been preening?
could she not have been preening?
could we not have been preening?
could you not have been preening?
could they not have been preening?