could film
Regular verb: film - filmed- filmed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could film
you could film
she could film
we could film
you could film
they could film 	I could be filming
you could be filming
she could be filming
we could be filming
you could be filming
they could be filming	I could have filmed
you could have filmed
she could have filmed
we could have filmed
you could have filmed
they could have filmed	I could have been filming
you could have been filming
she could have been filming
we could have been filming
you could have been filming
they could have been filming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not film
you could not film
she could not film
we could not film
you could not film
they could not film 	I could not be filming
you could not be filming
she could not be filming
we could not be filming
you could not be filming
they could not be filming	I could not have filmed
you could not have filmed
she could not have filmed
we could not have filmed
you could not have filmed
they could not have filmed	I could not have been filming
you could not have been filming
she could not have been filming
we could not have been filming
you could not have been filming
they could not have been filming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I film?
could you film?
could she film?
could we film?
could you film?
could they film? 	could I be filming?
could you be filming?
could she be filming?
could we be filming?
could you be filming?
could they be filming? 	could I have filmed?
could you have filmed?
could she have filmed?
could we have filmed?
could you have filmed?
could they have filmed? 	could I have been filming?
could you have been filming?
could she have been filming?
could we have been filming?
could you have been filming?
could they have been filming? 	

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