could ionize
Regular verb: ionize - ionized- ionized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could ionize
you could ionize
he could ionize
we could ionize
you could ionize
they could ionize 	I could be ionizing
you could be ionizing
he could be ionizing
we could be ionizing
you could be ionizing
they could be ionizing	I could have ionized
you could have ionized
he could have ionized
we could have ionized
you could have ionized
they could have ionized	I could have been ionizing
you could have been ionizing
he could have been ionizing
we could have been ionizing
you could have been ionizing
they could have been ionizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't ionize
you couldn't ionize
he couldn't ionize
we couldn't ionize
you couldn't ionize
they couldn't ionize 	I couldn't be ionizing
you couldn't be ionizing
he couldn't be ionizing
we couldn't be ionizing
you couldn't be ionizing
they couldn't be ionizing	I couldn't have ionized
you couldn't have ionized
he couldn't have ionized
we couldn't have ionized
you couldn't have ionized
they couldn't have ionized	I couldn't have been ionizing
you couldn't have been ionizing
he couldn't have been ionizing
we couldn't have been ionizing
you couldn't have been ionizing
they couldn't have been ionizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I ionize?
could you ionize?
could he ionize?
could we ionize?
could you ionize?
could they ionize? 	could I be ionizing?
could you be ionizing?
could he be ionizing?
could we be ionizing?
could you be ionizing?
could they be ionizing? 	could I have ionized?
could you have ionized?
could he have ionized?
could we have ionized?
could you have ionized?
could they have ionized? 	could I have been ionizing?
could you have been ionizing?
could he have been ionizing?
could we have been ionizing?
could you have been ionizing?
could they have been ionizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I ionize?
couldn't you ionize?
couldn't he ionize?
couldn't we ionize?
couldn't you ionize?
couldn't they ionize? 	couldn't I be ionizing?
couldn't you be ionizing?
couldn't he be ionizing?
couldn't we be ionizing?
couldn't you be ionizing?
couldn't they be ionizing? 	couldn't I have ionized?
couldn't you have ionized?
couldn't he have ionized?
couldn't we have ionized?
couldn't you have ionized?
couldn't they have ionized? 	couldn't I have been ionizing?
couldn't you have been ionizing?
couldn't he have been ionizing?
couldn't we have been ionizing?
couldn't you have been ionizing?
couldn't they have been ionizing?