English verb conjugation
COULD SLAM

Regular verb: slam - slammed - slammed

Affirmation

Simple form	V-ing form
I could slam you could slam she could slam we could slam you could slam they could slam	I could be slamming you could be slamming she could be slamming we could be slamming you could be slamming they could be slamming
Perfect	V-ing perfect
I could have slammed you could have slammed she could have slammed we could have slammed you could have slammed they could have slammed	I could have been slamming you could have been slamming she could have been slamming we could have been slamming you could have been slamming they could have been slamming

Negation

Simple form	V-ing form
I could not slam you could not slam she could not slam we could not slam you could not slam they could not slam	I could not be slamming you could not be slamming she could not be slamming we could not be slamming you could not be slamming they could not be slamming
Perfect	V-ing perfect
I could not have slammed you could not have slammed she could not have slammed we could not have slammed you could not have slammed they could not have slammed	I could not have been slamming you could not have been slamming she could not have been slamming we could not have been slamming you could not have been slamming they could not have been slamming

Interrogative form

Simple form	V-ing form
could I slam? could you slam? could she slam? could we slam? could you slam? could they slam?	could I be slamming? could you be slamming? could she be slamming? could we be slamming? could you be slamming? could they be slamming?
Perfect	V-ing perfect
could I have slammed? could you have slammed? could she have slammed? could we have slammed? could you have slammed? could they have slammed?	could I have been slamming? could you have been slamming? could she have been slamming? could we have been slamming? could you have been slamming? could they have been slamming?

Interro-negative form

Simple form	V-ing form
could I not slam? could you not slam? could she not slam? could we not slam? could you not slam? could they not slam?	could I not be slamming? could you not be slamming? could she not be slamming? could we not be slamming? could you not be slamming? could they not be slamming?
Perfect	V-ing perfect
could I not have slammed? could you not have slammed? could she not have slammed? could we not have slammed? could you not have slammed? could they not have slammed?	could I not have been slamming? could you not have been slamming? could she not have been slamming? could we not have been slamming? could you not have been slamming? could they not have been slamming?