English verb conjugation
COULD SLAM

Regular verb: slam - slammed - slammed

Affirmation

Simple form	V-ing form
I could slam you could slam he could slam we could slam you could slam they could slam	I could be slamming you could be slamming he 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 he 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 he 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 couldn't slam you couldn't slam he couldn't slam we couldn't slam you couldn't slam they couldn't slam	I couldn't be slamming you couldn't be slamming he couldn't be slamming we couldn't be slamming you couldn't be slamming they couldn't be slamming
Perfect	V-ing perfect
I couldn't have slammed you couldn't have slammed he couldn't have slammed we couldn't have slammed you couldn't have slammed they couldn't have slammed	I couldn't have been slamming you couldn't have been slamming he couldn't have been slamming we couldn't have been slamming you couldn't have been slamming they couldn't have been slamming

Interrogative form

Simple form	V-ing form
could I slam? could you slam? could he slam? could we slam? could you slam? could they slam?	could I be slamming? could you be slamming? could he 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 he 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 he 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
couldn't I slam? couldn't you slam? couldn't he slam? couldn't we slam? couldn't you slam? couldn't they slam?	couldn't I be slamming? couldn't you be slamming? couldn't he be slamming? couldn't we be slamming? couldn't you be slamming? couldn't they be slamming?
Perfect	V-ing perfect
couldn't I have slammed? couldn't you have slammed? couldn't he have slammed? couldn't we have slammed? couldn't you have slammed? couldn't they have slammed?	couldn't I have been slamming? couldn't you have been slamming? couldn't he have been slamming? couldn't we have been slamming? couldn't you have been slamming? couldn't they have been slamming?