could bump
Regular verb: bump - bumped- bumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bump
you could bump
he could bump
we could bump
you could bump
they could bump 	I could be bumping
you could be bumping
he could be bumping
we could be bumping
you could be bumping
they could be bumping	I could have bumped
you could have bumped
he could have bumped
we could have bumped
you could have bumped
they could have bumped	I could have been bumping
you could have been bumping
he could have been bumping
we could have been bumping
you could have been bumping
they could have been bumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bump
you couldn't bump
he couldn't bump
we couldn't bump
you couldn't bump
they couldn't bump 	I couldn't be bumping
you couldn't be bumping
he couldn't be bumping
we couldn't be bumping
you couldn't be bumping
they couldn't be bumping	I couldn't have bumped
you couldn't have bumped
he couldn't have bumped
we couldn't have bumped
you couldn't have bumped
they couldn't have bumped	I couldn't have been bumping
you couldn't have been bumping
he couldn't have been bumping
we couldn't have been bumping
you couldn't have been bumping
they couldn't have been bumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I bump?
could you bump?
could he bump?
could we bump?
could you bump?
could they bump? 	could I be bumping?
could you be bumping?
could he be bumping?
could we be bumping?
could you be bumping?
could they be bumping? 	could I have bumped?
could you have bumped?
could he have bumped?
could we have bumped?
could you have bumped?
could they have bumped? 	could I have been bumping?
could you have been bumping?
could he have been bumping?
could we have been bumping?
could you have been bumping?
could they have been bumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I bump?
couldn't you bump?
couldn't he bump?
couldn't we bump?
couldn't you bump?
couldn't they bump? 	couldn't I be bumping?
couldn't you be bumping?
couldn't he be bumping?
couldn't we be bumping?
couldn't you be bumping?
couldn't they be bumping? 	couldn't I have bumped?
couldn't you have bumped?
couldn't he have bumped?
couldn't we have bumped?
couldn't you have bumped?
couldn't they have bumped? 	couldn't I have been bumping?
couldn't you have been bumping?
couldn't he have been bumping?
couldn't we have been bumping?
couldn't you have been bumping?
couldn't they have been bumping?