English verb conjugation
COULD FILM

Regular verb: film - filmed - filmed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't film you couldn't film she couldn't film we couldn't film you couldn't film they couldn't film	I couldn't be filming you couldn't be filming she couldn't be filming we couldn't be filming you couldn't be filming they couldn't be filming
Perfect	V-ing perfect
I couldn't have filmed you couldn't have filmed she couldn't have filmed we couldn't have filmed you couldn't have filmed they couldn't have filmed	I couldn't have been filming you couldn't have been filming she couldn't have been filming we couldn't have been filming you couldn't have been filming they couldn't have been filming

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
couldn't I film? couldn't you film? couldn't she film? couldn't we film? couldn't you film? couldn't they film?	couldn't I be filming? couldn't you be filming? couldn't she be filming? couldn't we be filming? couldn't you be filming? couldn't they be filming?
Perfect	V-ing perfect
couldn't I have filmed? couldn't you have filmed? couldn't she have filmed? couldn't we have filmed? couldn't you have filmed? couldn't they have filmed?	couldn't I have been filming? couldn't you have been filming? couldn't she have been filming? couldn't we have been filming? couldn't you have been filming? couldn't they have been filming?