could retract
Verbo regular: retract - retracted- retracted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could retract
you could retract
he could retract
we could retract
you could retract
they could retract 	I could be retracting
you could be retracting
he could be retracting
we could be retracting
you could be retracting
they could be retracting	I could have retracted
you could have retracted
he could have retracted
we could have retracted
you could have retracted
they could have retracted	I could have been retracting
you could have been retracting
he could have been retracting
we could have been retracting
you could have been retracting
they could have been retracting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't retract
you couldn't retract
he couldn't retract
we couldn't retract
you couldn't retract
they couldn't retract 	I couldn't be retracting
you couldn't be retracting
he couldn't be retracting
we couldn't be retracting
you couldn't be retracting
they couldn't be retracting	I couldn't have retracted
you couldn't have retracted
he couldn't have retracted
we couldn't have retracted
you couldn't have retracted
they couldn't have retracted	I couldn't have been retracting
you couldn't have been retracting
he couldn't have been retracting
we couldn't have been retracting
you couldn't have been retracting
they couldn't have been retracting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I retract?
could you retract?
could he retract?
could we retract?
could you retract?
could they retract? 	could I be retracting?
could you be retracting?
could he be retracting?
could we be retracting?
could you be retracting?
could they be retracting? 	could I have retracted?
could you have retracted?
could he have retracted?
could we have retracted?
could you have retracted?
could they have retracted? 	could I have been retracting?
could you have been retracting?
could he have been retracting?
could we have been retracting?
could you have been retracting?
could they have been retracting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I retract?
couldn't you retract?
couldn't he retract?
couldn't we retract?
couldn't you retract?
couldn't they retract? 	couldn't I be retracting?
couldn't you be retracting?
couldn't he be retracting?
couldn't we be retracting?
couldn't you be retracting?
couldn't they be retracting? 	couldn't I have retracted?
couldn't you have retracted?
couldn't he have retracted?
couldn't we have retracted?
couldn't you have retracted?
couldn't they have retracted? 	couldn't I have been retracting?
couldn't you have been retracting?
couldn't he have been retracting?
couldn't we have been retracting?
couldn't you have been retracting?
couldn't they have been retracting?