could butterfly
Verbo regular: butterfly - butterflied- butterflied

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could butterfly
you could butterfly
he could butterfly
we could butterfly
you could butterfly
they could butterfly 	I could be butterflying
you could be butterflying
he could be butterflying
we could be butterflying
you could be butterflying
they could be butterflying	I could have butterflied
you could have butterflied
he could have butterflied
we could have butterflied
you could have butterflied
they could have butterflied	I could have been butterflying
you could have been butterflying
he could have been butterflying
we could have been butterflying
you could have been butterflying
they could have been butterflying	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not butterfly
you could not butterfly
he could not butterfly
we could not butterfly
you could not butterfly
they could not butterfly 	I could not be butterflying
you could not be butterflying
he could not be butterflying
we could not be butterflying
you could not be butterflying
they could not be butterflying	I could not have butterflied
you could not have butterflied
he could not have butterflied
we could not have butterflied
you could not have butterflied
they could not have butterflied	I could not have been butterflying
you could not have been butterflying
he could not have been butterflying
we could not have been butterflying
you could not have been butterflying
they could not have been butterflying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I butterfly?
could you butterfly?
could he butterfly?
could we butterfly?
could you butterfly?
could they butterfly? 	could I be butterflying?
could you be butterflying?
could he be butterflying?
could we be butterflying?
could you be butterflying?
could they be butterflying? 	could I have butterflied?
could you have butterflied?
could he have butterflied?
could we have butterflied?
could you have butterflied?
could they have butterflied? 	could I have been butterflying?
could you have been butterflying?
could he have been butterflying?
could we have been butterflying?
could you have been butterflying?
could they have been butterflying? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not butterfly?
could you not butterfly?
could he not butterfly?
could we not butterfly?
could you not butterfly?
could they not butterfly? 	could I not be butterflying?
could you not be butterflying?
could he not be butterflying?
could we not be butterflying?
could you not be butterflying?
could they not be butterflying? 	could I not have butterflied?
could you not have butterflied?
could he not have butterflied?
could we not have butterflied?
could you not have butterflied?
could they not have butterflied? 	could I not have been butterflying?
could you not have been butterflying?
could he not have been butterflying?
could we not have been butterflying?
could you not have been butterflying?
could they not have been butterflying?