could thrum
Verbo regular: thrum - thrumed- thrumed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could thrum
you could thrum
he could thrum
we could thrum
you could thrum
they could thrum 	I could be thruming
you could be thruming
he could be thruming
we could be thruming
you could be thruming
they could be thruming	I could have thrumed
you could have thrumed
he could have thrumed
we could have thrumed
you could have thrumed
they could have thrumed	I could have been thruming
you could have been thruming
he could have been thruming
we could have been thruming
you could have been thruming
they could have been thruming	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't thrum
you couldn't thrum
he couldn't thrum
we couldn't thrum
you couldn't thrum
they couldn't thrum 	I couldn't be thruming
you couldn't be thruming
he couldn't be thruming
we couldn't be thruming
you couldn't be thruming
they couldn't be thruming	I couldn't have thrumed
you couldn't have thrumed
he couldn't have thrumed
we couldn't have thrumed
you couldn't have thrumed
they couldn't have thrumed	I couldn't have been thruming
you couldn't have been thruming
he couldn't have been thruming
we couldn't have been thruming
you couldn't have been thruming
they couldn't have been thruming	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I thrum?
could you thrum?
could he thrum?
could we thrum?
could you thrum?
could they thrum? 	could I be thruming?
could you be thruming?
could he be thruming?
could we be thruming?
could you be thruming?
could they be thruming? 	could I have thrumed?
could you have thrumed?
could he have thrumed?
could we have thrumed?
could you have thrumed?
could they have thrumed? 	could I have been thruming?
could you have been thruming?
could he have been thruming?
could we have been thruming?
could you have been thruming?
could they have been thruming? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I thrum?
couldn't you thrum?
couldn't he thrum?
couldn't we thrum?
couldn't you thrum?
couldn't they thrum? 	couldn't I be thruming?
couldn't you be thruming?
couldn't he be thruming?
couldn't we be thruming?
couldn't you be thruming?
couldn't they be thruming? 	couldn't I have thrumed?
couldn't you have thrumed?
couldn't he have thrumed?
couldn't we have thrumed?
couldn't you have thrumed?
couldn't they have thrumed? 	couldn't I have been thruming?
couldn't you have been thruming?
couldn't he have been thruming?
couldn't we have been thruming?
couldn't you have been thruming?
couldn't they have been thruming?