could tranquilize
Verbo regular: tranquilize - tranquilized- tranquilized

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could tranquilize
you could tranquilize
he could tranquilize
we could tranquilize
you could tranquilize
they could tranquilize 	I could be tranquilizing
you could be tranquilizing
he could be tranquilizing
we could be tranquilizing
you could be tranquilizing
they could be tranquilizing	I could have tranquilized
you could have tranquilized
he could have tranquilized
we could have tranquilized
you could have tranquilized
they could have tranquilized	I could have been tranquilizing
you could have been tranquilizing
he could have been tranquilizing
we could have been tranquilizing
you could have been tranquilizing
they could have been tranquilizing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't tranquilize
you couldn't tranquilize
he couldn't tranquilize
we couldn't tranquilize
you couldn't tranquilize
they couldn't tranquilize 	I couldn't be tranquilizing
you couldn't be tranquilizing
he couldn't be tranquilizing
we couldn't be tranquilizing
you couldn't be tranquilizing
they couldn't be tranquilizing	I couldn't have tranquilized
you couldn't have tranquilized
he couldn't have tranquilized
we couldn't have tranquilized
you couldn't have tranquilized
they couldn't have tranquilized	I couldn't have been tranquilizing
you couldn't have been tranquilizing
he couldn't have been tranquilizing
we couldn't have been tranquilizing
you couldn't have been tranquilizing
they couldn't have been tranquilizing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I tranquilize?
could you tranquilize?
could he tranquilize?
could we tranquilize?
could you tranquilize?
could they tranquilize? 	could I be tranquilizing?
could you be tranquilizing?
could he be tranquilizing?
could we be tranquilizing?
could you be tranquilizing?
could they be tranquilizing? 	could I have tranquilized?
could you have tranquilized?
could he have tranquilized?
could we have tranquilized?
could you have tranquilized?
could they have tranquilized? 	could I have been tranquilizing?
could you have been tranquilizing?
could he have been tranquilizing?
could we have been tranquilizing?
could you have been tranquilizing?
could they have been tranquilizing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I tranquilize?
couldn't you tranquilize?
couldn't he tranquilize?
couldn't we tranquilize?
couldn't you tranquilize?
couldn't they tranquilize? 	couldn't I be tranquilizing?
couldn't you be tranquilizing?
couldn't he be tranquilizing?
couldn't we be tranquilizing?
couldn't you be tranquilizing?
couldn't they be tranquilizing? 	couldn't I have tranquilized?
couldn't you have tranquilized?
couldn't he have tranquilized?
couldn't we have tranquilized?
couldn't you have tranquilized?
couldn't they have tranquilized? 	couldn't I have been tranquilizing?
couldn't you have been tranquilizing?
couldn't he have been tranquilizing?
couldn't we have been tranquilizing?
couldn't you have been tranquilizing?
couldn't they have been tranquilizing?