could slam
Regular verb: slam - slammed- slammed

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