could validate
Verbo regular: validate - validated- validated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could validate
you could validate
he could validate
we could validate
you could validate
they could validate 	I could be validating
you could be validating
he could be validating
we could be validating
you could be validating
they could be validating	I could have validated
you could have validated
he could have validated
we could have validated
you could have validated
they could have validated	I could have been validating
you could have been validating
he could have been validating
we could have been validating
you could have been validating
they could have been validating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not validate
you could not validate
he could not validate
we could not validate
you could not validate
they could not validate 	I could not be validating
you could not be validating
he could not be validating
we could not be validating
you could not be validating
they could not be validating	I could not have validated
you could not have validated
he could not have validated
we could not have validated
you could not have validated
they could not have validated	I could not have been validating
you could not have been validating
he could not have been validating
we could not have been validating
you could not have been validating
they could not have been validating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I validate?
could you validate?
could he validate?
could we validate?
could you validate?
could they validate? 	could I be validating?
could you be validating?
could he be validating?
could we be validating?
could you be validating?
could they be validating? 	could I have validated?
could you have validated?
could he have validated?
could we have validated?
could you have validated?
could they have validated? 	could I have been validating?
could you have been validating?
could he have been validating?
could we have been validating?
could you have been validating?
could they have been validating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not validate?
could you not validate?
could he not validate?
could we not validate?
could you not validate?
could they not validate? 	could I not be validating?
could you not be validating?
could he not be validating?
could we not be validating?
could you not be validating?
could they not be validating? 	could I not have validated?
could you not have validated?
could he not have validated?
could we not have validated?
could you not have validated?
could they not have validated? 	could I not have been validating?
could you not have been validating?
could he not have been validating?
could we not have been validating?
could you not have been validating?
could they not have been validating?