could buzz
Verbo regular: buzz - buzzed- buzzed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could buzz
you could buzz
he could buzz
we could buzz
you could buzz
they could buzz 	I could be buzzing
you could be buzzing
he could be buzzing
we could be buzzing
you could be buzzing
they could be buzzing	I could have buzzed
you could have buzzed
he could have buzzed
we could have buzzed
you could have buzzed
they could have buzzed	I could have been buzzing
you could have been buzzing
he could have been buzzing
we could have been buzzing
you could have been buzzing
they could have been buzzing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not buzz
you could not buzz
he could not buzz
we could not buzz
you could not buzz
they could not buzz 	I could not be buzzing
you could not be buzzing
he could not be buzzing
we could not be buzzing
you could not be buzzing
they could not be buzzing	I could not have buzzed
you could not have buzzed
he could not have buzzed
we could not have buzzed
you could not have buzzed
they could not have buzzed	I could not have been buzzing
you could not have been buzzing
he could not have been buzzing
we could not have been buzzing
you could not have been buzzing
they could not have been buzzing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I buzz?
could you buzz?
could he buzz?
could we buzz?
could you buzz?
could they buzz? 	could I be buzzing?
could you be buzzing?
could he be buzzing?
could we be buzzing?
could you be buzzing?
could they be buzzing? 	could I have buzzed?
could you have buzzed?
could he have buzzed?
could we have buzzed?
could you have buzzed?
could they have buzzed? 	could I have been buzzing?
could you have been buzzing?
could he have been buzzing?
could we have been buzzing?
could you have been buzzing?
could they have been buzzing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not buzz?
could you not buzz?
could he not buzz?
could we not buzz?
could you not buzz?
could they not buzz? 	could I not be buzzing?
could you not be buzzing?
could he not be buzzing?
could we not be buzzing?
could you not be buzzing?
could they not be buzzing? 	could I not have buzzed?
could you not have buzzed?
could he not have buzzed?
could we not have buzzed?
could you not have buzzed?
could they not have buzzed? 	could I not have been buzzing?
could you not have been buzzing?
could he not have been buzzing?
could we not have been buzzing?
could you not have been buzzing?
could they not have been buzzing?