could bump
Regular verb: bump - bumped- bumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bump
you could bump
she could bump
we could bump
you could bump
they could bump 	I could be bumping
you could be bumping
she could be bumping
we could be bumping
you could be bumping
they could be bumping	I could have bumped
you could have bumped
she 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
she 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
she 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
she 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
she 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
she 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 she bump?
could we bump?
could you bump?
could they bump? 	could I be bumping?
could you be bumping?
could she be bumping?
could we be bumping?
could you be bumping?
could they be bumping? 	could I have bumped?
could you have bumped?
could she 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 she 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 she 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 she 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 she 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 she have been bumping?
couldn't we have been bumping?
couldn't you have been bumping?
couldn't they have been bumping?