could thump
Regular verb: thump - thumped- thumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could thump
you could thump
he could thump
we could thump
you could thump
they could thump 	I could be thumping
you could be thumping
he could be thumping
we could be thumping
you could be thumping
they could be thumping	I could have thumped
you could have thumped
he could have thumped
we could have thumped
you could have thumped
they could have thumped	I could have been thumping
you could have been thumping
he could have been thumping
we could have been thumping
you could have been thumping
they could have been thumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't thump
you couldn't thump
he couldn't thump
we couldn't thump
you couldn't thump
they couldn't thump 	I couldn't be thumping
you couldn't be thumping
he couldn't be thumping
we couldn't be thumping
you couldn't be thumping
they couldn't be thumping	I couldn't have thumped
you couldn't have thumped
he couldn't have thumped
we couldn't have thumped
you couldn't have thumped
they couldn't have thumped	I couldn't have been thumping
you couldn't have been thumping
he couldn't have been thumping
we couldn't have been thumping
you couldn't have been thumping
they couldn't have been thumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I thump?
could you thump?
could he thump?
could we thump?
could you thump?
could they thump? 	could I be thumping?
could you be thumping?
could he be thumping?
could we be thumping?
could you be thumping?
could they be thumping? 	could I have thumped?
could you have thumped?
could he have thumped?
could we have thumped?
could you have thumped?
could they have thumped? 	could I have been thumping?
could you have been thumping?
could he have been thumping?
could we have been thumping?
could you have been thumping?
could they have been thumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I thump?
couldn't you thump?
couldn't he thump?
couldn't we thump?
couldn't you thump?
couldn't they thump? 	couldn't I be thumping?
couldn't you be thumping?
couldn't he be thumping?
couldn't we be thumping?
couldn't you be thumping?
couldn't they be thumping? 	couldn't I have thumped?
couldn't you have thumped?
couldn't he have thumped?
couldn't we have thumped?
couldn't you have thumped?
couldn't they have thumped? 	couldn't I have been thumping?
couldn't you have been thumping?
couldn't he have been thumping?
couldn't we have been thumping?
couldn't you have been thumping?
couldn't they have been thumping?