could thump
Regular verb: thump - thumped- thumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could thump
you could thump
she could thump
we could thump
you could thump
they could thump 	I could be thumping
you could be thumping
she could be thumping
we could be thumping
you could be thumping
they could be thumping	I could have thumped
you could have thumped
she 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
she 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
she 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
she 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
she 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
she 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 she thump?
could we thump?
could you thump?
could they thump? 	could I be thumping?
could you be thumping?
could she be thumping?
could we be thumping?
could you be thumping?
could they be thumping? 	could I have thumped?
could you have thumped?
could she 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 she 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 she 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 she 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 she 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 she have been thumping?
couldn't we have been thumping?
couldn't you have been thumping?
couldn't they have been thumping?