could flutter
Verbo regular: flutter - fluttered- fluttered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could flutter
you could flutter
he could flutter
we could flutter
you could flutter
they could flutter 	I could be fluttering
you could be fluttering
he could be fluttering
we could be fluttering
you could be fluttering
they could be fluttering	I could have fluttered
you could have fluttered
he could have fluttered
we could have fluttered
you could have fluttered
they could have fluttered	I could have been fluttering
you could have been fluttering
he could have been fluttering
we could have been fluttering
you could have been fluttering
they could have been fluttering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not flutter
you could not flutter
he could not flutter
we could not flutter
you could not flutter
they could not flutter 	I could not be fluttering
you could not be fluttering
he could not be fluttering
we could not be fluttering
you could not be fluttering
they could not be fluttering	I could not have fluttered
you could not have fluttered
he could not have fluttered
we could not have fluttered
you could not have fluttered
they could not have fluttered	I could not have been fluttering
you could not have been fluttering
he could not have been fluttering
we could not have been fluttering
you could not have been fluttering
they could not have been fluttering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I flutter?
could you flutter?
could he flutter?
could we flutter?
could you flutter?
could they flutter? 	could I be fluttering?
could you be fluttering?
could he be fluttering?
could we be fluttering?
could you be fluttering?
could they be fluttering? 	could I have fluttered?
could you have fluttered?
could he have fluttered?
could we have fluttered?
could you have fluttered?
could they have fluttered? 	could I have been fluttering?
could you have been fluttering?
could he have been fluttering?
could we have been fluttering?
could you have been fluttering?
could they have been fluttering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not flutter?
could you not flutter?
could he not flutter?
could we not flutter?
could you not flutter?
could they not flutter? 	could I not be fluttering?
could you not be fluttering?
could he not be fluttering?
could we not be fluttering?
could you not be fluttering?
could they not be fluttering? 	could I not have fluttered?
could you not have fluttered?
could he not have fluttered?
could we not have fluttered?
could you not have fluttered?
could they not have fluttered? 	could I not have been fluttering?
could you not have been fluttering?
could he not have been fluttering?
could we not have been fluttering?
could you not have been fluttering?
could they not have been fluttering?