could prefertilize
Regular verb: prefertilize - prefertilized- prefertilized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could prefertilize
you could prefertilize
she could prefertilize
we could prefertilize
you could prefertilize
they could prefertilize 	I could be prefertilizing
you could be prefertilizing
she could be prefertilizing
we could be prefertilizing
you could be prefertilizing
they could be prefertilizing	I could have prefertilized
you could have prefertilized
she could have prefertilized
we could have prefertilized
you could have prefertilized
they could have prefertilized	I could have been prefertilizing
you could have been prefertilizing
she could have been prefertilizing
we could have been prefertilizing
you could have been prefertilizing
they could have been prefertilizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't prefertilize
you couldn't prefertilize
she couldn't prefertilize
we couldn't prefertilize
you couldn't prefertilize
they couldn't prefertilize 	I couldn't be prefertilizing
you couldn't be prefertilizing
she couldn't be prefertilizing
we couldn't be prefertilizing
you couldn't be prefertilizing
they couldn't be prefertilizing	I couldn't have prefertilized
you couldn't have prefertilized
she couldn't have prefertilized
we couldn't have prefertilized
you couldn't have prefertilized
they couldn't have prefertilized	I couldn't have been prefertilizing
you couldn't have been prefertilizing
she couldn't have been prefertilizing
we couldn't have been prefertilizing
you couldn't have been prefertilizing
they couldn't have been prefertilizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I prefertilize?
could you prefertilize?
could she prefertilize?
could we prefertilize?
could you prefertilize?
could they prefertilize? 	could I be prefertilizing?
could you be prefertilizing?
could she be prefertilizing?
could we be prefertilizing?
could you be prefertilizing?
could they be prefertilizing? 	could I have prefertilized?
could you have prefertilized?
could she have prefertilized?
could we have prefertilized?
could you have prefertilized?
could they have prefertilized? 	could I have been prefertilizing?
could you have been prefertilizing?
could she have been prefertilizing?
could we have been prefertilizing?
could you have been prefertilizing?
could they have been prefertilizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I prefertilize?
couldn't you prefertilize?
couldn't she prefertilize?
couldn't we prefertilize?
couldn't you prefertilize?
couldn't they prefertilize? 	couldn't I be prefertilizing?
couldn't you be prefertilizing?
couldn't she be prefertilizing?
couldn't we be prefertilizing?
couldn't you be prefertilizing?
couldn't they be prefertilizing? 	couldn't I have prefertilized?
couldn't you have prefertilized?
couldn't she have prefertilized?
couldn't we have prefertilized?
couldn't you have prefertilized?
couldn't they have prefertilized? 	couldn't I have been prefertilizing?
couldn't you have been prefertilizing?
couldn't she have been prefertilizing?
couldn't we have been prefertilizing?
couldn't you have been prefertilizing?
couldn't they have been prefertilizing?