could formalize
Regular verb: formalize - formalized- formalized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could formalize
you could formalize
he could formalize
we could formalize
you could formalize
they could formalize 	I could be formalizing
you could be formalizing
he could be formalizing
we could be formalizing
you could be formalizing
they could be formalizing	I could have formalized
you could have formalized
he could have formalized
we could have formalized
you could have formalized
they could have formalized	I could have been formalizing
you could have been formalizing
he could have been formalizing
we could have been formalizing
you could have been formalizing
they could have been formalizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't formalize
you couldn't formalize
he couldn't formalize
we couldn't formalize
you couldn't formalize
they couldn't formalize 	I couldn't be formalizing
you couldn't be formalizing
he couldn't be formalizing
we couldn't be formalizing
you couldn't be formalizing
they couldn't be formalizing	I couldn't have formalized
you couldn't have formalized
he couldn't have formalized
we couldn't have formalized
you couldn't have formalized
they couldn't have formalized	I couldn't have been formalizing
you couldn't have been formalizing
he couldn't have been formalizing
we couldn't have been formalizing
you couldn't have been formalizing
they couldn't have been formalizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I formalize?
could you formalize?
could he formalize?
could we formalize?
could you formalize?
could they formalize? 	could I be formalizing?
could you be formalizing?
could he be formalizing?
could we be formalizing?
could you be formalizing?
could they be formalizing? 	could I have formalized?
could you have formalized?
could he have formalized?
could we have formalized?
could you have formalized?
could they have formalized? 	could I have been formalizing?
could you have been formalizing?
could he have been formalizing?
could we have been formalizing?
could you have been formalizing?
could they have been formalizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I formalize?
couldn't you formalize?
couldn't he formalize?
couldn't we formalize?
couldn't you formalize?
couldn't they formalize? 	couldn't I be formalizing?
couldn't you be formalizing?
couldn't he be formalizing?
couldn't we be formalizing?
couldn't you be formalizing?
couldn't they be formalizing? 	couldn't I have formalized?
couldn't you have formalized?
couldn't he have formalized?
couldn't we have formalized?
couldn't you have formalized?
couldn't they have formalized? 	couldn't I have been formalizing?
couldn't you have been formalizing?
couldn't he have been formalizing?
couldn't we have been formalizing?
couldn't you have been formalizing?
couldn't they have been formalizing?