could drum
Regular verb: drum - drummed- drummed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could drum
you could drum
she could drum
we could drum
you could drum
they could drum 	I could be drumming
you could be drumming
she could be drumming
we could be drumming
you could be drumming
they could be drumming	I could have drummed
you could have drummed
she could have drummed
we could have drummed
you could have drummed
they could have drummed	I could have been drumming
you could have been drumming
she could have been drumming
we could have been drumming
you could have been drumming
they could have been drumming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't drum
you couldn't drum
she couldn't drum
we couldn't drum
you couldn't drum
they couldn't drum 	I couldn't be drumming
you couldn't be drumming
she couldn't be drumming
we couldn't be drumming
you couldn't be drumming
they couldn't be drumming	I couldn't have drummed
you couldn't have drummed
she couldn't have drummed
we couldn't have drummed
you couldn't have drummed
they couldn't have drummed	I couldn't have been drumming
you couldn't have been drumming
she couldn't have been drumming
we couldn't have been drumming
you couldn't have been drumming
they couldn't have been drumming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I drum?
could you drum?
could she drum?
could we drum?
could you drum?
could they drum? 	could I be drumming?
could you be drumming?
could she be drumming?
could we be drumming?
could you be drumming?
could they be drumming? 	could I have drummed?
could you have drummed?
could she have drummed?
could we have drummed?
could you have drummed?
could they have drummed? 	could I have been drumming?
could you have been drumming?
could she have been drumming?
could we have been drumming?
could you have been drumming?
could they have been drumming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I drum?
couldn't you drum?
couldn't she drum?
couldn't we drum?
couldn't you drum?
couldn't they drum? 	couldn't I be drumming?
couldn't you be drumming?
couldn't she be drumming?
couldn't we be drumming?
couldn't you be drumming?
couldn't they be drumming? 	couldn't I have drummed?
couldn't you have drummed?
couldn't she have drummed?
couldn't we have drummed?
couldn't you have drummed?
couldn't they have drummed? 	couldn't I have been drumming?
couldn't you have been drumming?
couldn't she have been drumming?
couldn't we have been drumming?
couldn't you have been drumming?
couldn't they have been drumming?