could vitalize
Regular verb: vitalize - vitalized- vitalized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vitalize
you could vitalize
he could vitalize
we could vitalize
you could vitalize
they could vitalize 	I could be vitalizing
you could be vitalizing
he could be vitalizing
we could be vitalizing
you could be vitalizing
they could be vitalizing	I could have vitalized
you could have vitalized
he could have vitalized
we could have vitalized
you could have vitalized
they could have vitalized	I could have been vitalizing
you could have been vitalizing
he could have been vitalizing
we could have been vitalizing
you could have been vitalizing
they could have been vitalizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't vitalize
you couldn't vitalize
he couldn't vitalize
we couldn't vitalize
you couldn't vitalize
they couldn't vitalize 	I couldn't be vitalizing
you couldn't be vitalizing
he couldn't be vitalizing
we couldn't be vitalizing
you couldn't be vitalizing
they couldn't be vitalizing	I couldn't have vitalized
you couldn't have vitalized
he couldn't have vitalized
we couldn't have vitalized
you couldn't have vitalized
they couldn't have vitalized	I couldn't have been vitalizing
you couldn't have been vitalizing
he couldn't have been vitalizing
we couldn't have been vitalizing
you couldn't have been vitalizing
they couldn't have been vitalizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vitalize?
could you vitalize?
could he vitalize?
could we vitalize?
could you vitalize?
could they vitalize? 	could I be vitalizing?
could you be vitalizing?
could he be vitalizing?
could we be vitalizing?
could you be vitalizing?
could they be vitalizing? 	could I have vitalized?
could you have vitalized?
could he have vitalized?
could we have vitalized?
could you have vitalized?
could they have vitalized? 	could I have been vitalizing?
could you have been vitalizing?
could he have been vitalizing?
could we have been vitalizing?
could you have been vitalizing?
could they have been vitalizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I vitalize?
couldn't you vitalize?
couldn't he vitalize?
couldn't we vitalize?
couldn't you vitalize?
couldn't they vitalize? 	couldn't I be vitalizing?
couldn't you be vitalizing?
couldn't he be vitalizing?
couldn't we be vitalizing?
couldn't you be vitalizing?
couldn't they be vitalizing? 	couldn't I have vitalized?
couldn't you have vitalized?
couldn't he have vitalized?
couldn't we have vitalized?
couldn't you have vitalized?
couldn't they have vitalized? 	couldn't I have been vitalizing?
couldn't you have been vitalizing?
couldn't he have been vitalizing?
couldn't we have been vitalizing?
couldn't you have been vitalizing?
couldn't they have been vitalizing?