could drum
Verbo regular: drum - drummed- drummed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could drum
you could drum
he could drum
we could drum
you could drum
they could drum 	I could be drumming
you could be drumming
he could be drumming
we could be drumming
you could be drumming
they could be drumming	I could have drummed
you could have drummed
he 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
he could have been drumming
we could have been drumming
you could have been drumming
they could have been drumming	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not drum
you could not drum
he could not drum
we could not drum
you could not drum
they could not drum 	I could not be drumming
you could not be drumming
he could not be drumming
we could not be drumming
you could not be drumming
they could not be drumming	I could not have drummed
you could not have drummed
he could not have drummed
we could not have drummed
you could not have drummed
they could not have drummed	I could not have been drumming
you could not have been drumming
he could not have been drumming
we could not have been drumming
you could not have been drumming
they could not have been drumming	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I drum?
could you drum?
could he drum?
could we drum?
could you drum?
could they drum? 	could I be drumming?
could you be drumming?
could he be drumming?
could we be drumming?
could you be drumming?
could they be drumming? 	could I have drummed?
could you have drummed?
could he 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 he have been drumming?
could we have been drumming?
could you have been drumming?
could they have been drumming? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not drum?
could you not drum?
could he not drum?
could we not drum?
could you not drum?
could they not drum? 	could I not be drumming?
could you not be drumming?
could he not be drumming?
could we not be drumming?
could you not be drumming?
could they not be drumming? 	could I not have drummed?
could you not have drummed?
could he not have drummed?
could we not have drummed?
could you not have drummed?
could they not have drummed? 	could I not have been drumming?
could you not have been drumming?
could he not have been drumming?
could we not have been drumming?
could you not have been drumming?
could they not have been drumming?