could form
Regular verb: form - formed- formed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could form
you could form
she could form
we could form
you could form
they could form 	I could be forming
you could be forming
she could be forming
we could be forming
you could be forming
they could be forming	I could have formed
you could have formed
she could have formed
we could have formed
you could have formed
they could have formed	I could have been forming
you could have been forming
she could have been forming
we could have been forming
you could have been forming
they could have been forming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not form
you could not form
she could not form
we could not form
you could not form
they could not form 	I could not be forming
you could not be forming
she could not be forming
we could not be forming
you could not be forming
they could not be forming	I could not have formed
you could not have formed
she could not have formed
we could not have formed
you could not have formed
they could not have formed	I could not have been forming
you could not have been forming
she could not have been forming
we could not have been forming
you could not have been forming
they could not have been forming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I form?
could you form?
could she form?
could we form?
could you form?
could they form? 	could I be forming?
could you be forming?
could she be forming?
could we be forming?
could you be forming?
could they be forming? 	could I have formed?
could you have formed?
could she have formed?
could we have formed?
could you have formed?
could they have formed? 	could I have been forming?
could you have been forming?
could she have been forming?
could we have been forming?
could you have been forming?
could they have been forming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not form?
could you not form?
could she not form?
could we not form?
could you not form?
could they not form? 	could I not be forming?
could you not be forming?
could she not be forming?
could we not be forming?
could you not be forming?
could they not be forming? 	could I not have formed?
could you not have formed?
could she not have formed?
could we not have formed?
could you not have formed?
could they not have formed? 	could I not have been forming?
could you not have been forming?
could she not have been forming?
could we not have been forming?
could you not have been forming?
could they not have been forming?