could tranquilize
Regular verb: tranquilize - tranquilized- tranquilized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tranquilize
you could tranquilize
she could tranquilize
we could tranquilize
you could tranquilize
they could tranquilize 	I could be tranquilizing
you could be tranquilizing
she could be tranquilizing
we could be tranquilizing
you could be tranquilizing
they could be tranquilizing	I could have tranquilized
you could have tranquilized
she 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
she could have been tranquilizing
we could have been tranquilizing
you could have been tranquilizing
they could have been tranquilizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tranquilize
you couldn't tranquilize
she 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
she 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
she 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
she couldn't have been tranquilizing
we couldn't have been tranquilizing
you couldn't have been tranquilizing
they couldn't have been tranquilizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tranquilize?
could you tranquilize?
could she tranquilize?
could we tranquilize?
could you tranquilize?
could they tranquilize? 	could I be tranquilizing?
could you be tranquilizing?
could she be tranquilizing?
could we be tranquilizing?
could you be tranquilizing?
could they be tranquilizing? 	could I have tranquilized?
could you have tranquilized?
could she 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 she have been tranquilizing?
could we have been tranquilizing?
could you have been tranquilizing?
could they have been tranquilizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tranquilize?
couldn't you tranquilize?
couldn't she 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 she 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 she 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 she have been tranquilizing?
couldn't we have been tranquilizing?
couldn't you have been tranquilizing?
couldn't they have been tranquilizing?