could presterilize
Regular verb: presterilize - presterilized- presterilized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could presterilize
you could presterilize
she could presterilize
we could presterilize
you could presterilize
they could presterilize 	I could be presterilizing
you could be presterilizing
she could be presterilizing
we could be presterilizing
you could be presterilizing
they could be presterilizing	I could have presterilized
you could have presterilized
she could have presterilized
we could have presterilized
you could have presterilized
they could have presterilized	I could have been presterilizing
you could have been presterilizing
she could have been presterilizing
we could have been presterilizing
you could have been presterilizing
they could have been presterilizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't presterilize
you couldn't presterilize
she couldn't presterilize
we couldn't presterilize
you couldn't presterilize
they couldn't presterilize 	I couldn't be presterilizing
you couldn't be presterilizing
she couldn't be presterilizing
we couldn't be presterilizing
you couldn't be presterilizing
they couldn't be presterilizing	I couldn't have presterilized
you couldn't have presterilized
she couldn't have presterilized
we couldn't have presterilized
you couldn't have presterilized
they couldn't have presterilized	I couldn't have been presterilizing
you couldn't have been presterilizing
she couldn't have been presterilizing
we couldn't have been presterilizing
you couldn't have been presterilizing
they couldn't have been presterilizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I presterilize?
could you presterilize?
could she presterilize?
could we presterilize?
could you presterilize?
could they presterilize? 	could I be presterilizing?
could you be presterilizing?
could she be presterilizing?
could we be presterilizing?
could you be presterilizing?
could they be presterilizing? 	could I have presterilized?
could you have presterilized?
could she have presterilized?
could we have presterilized?
could you have presterilized?
could they have presterilized? 	could I have been presterilizing?
could you have been presterilizing?
could she have been presterilizing?
could we have been presterilizing?
could you have been presterilizing?
could they have been presterilizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I presterilize?
couldn't you presterilize?
couldn't she presterilize?
couldn't we presterilize?
couldn't you presterilize?
couldn't they presterilize? 	couldn't I be presterilizing?
couldn't you be presterilizing?
couldn't she be presterilizing?
couldn't we be presterilizing?
couldn't you be presterilizing?
couldn't they be presterilizing? 	couldn't I have presterilized?
couldn't you have presterilized?
couldn't she have presterilized?
couldn't we have presterilized?
couldn't you have presterilized?
couldn't they have presterilized? 	couldn't I have been presterilizing?
couldn't you have been presterilizing?
couldn't she have been presterilizing?
couldn't we have been presterilizing?
couldn't you have been presterilizing?
couldn't they have been presterilizing?