can flutter
Verbo regular: flutter - fluttered- fluttered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can flutter
you can flutter
he can flutter
we can flutter
you can flutter
they can flutter 	I can be fluttering
you can be fluttering
he can be fluttering
we can be fluttering
you can be fluttering
they can be fluttering	I can have fluttered
you can have fluttered
he can have fluttered
we can have fluttered
you can have fluttered
they can have fluttered	I can have been fluttering
you can have been fluttering
he can have been fluttering
we can have been fluttering
you can have been fluttering
they can have been fluttering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot flutter
you cannot flutter
he cannot flutter
we cannot flutter
you cannot flutter
they cannot flutter 	I cannot be fluttering
you cannot be fluttering
he cannot be fluttering
we cannot be fluttering
you cannot be fluttering
they cannot be fluttering	I cannot have fluttered
you cannot have fluttered
he cannot have fluttered
we cannot have fluttered
you cannot have fluttered
they cannot have fluttered	I cannot have been fluttering
you cannot have been fluttering
he cannot have been fluttering
we cannot have been fluttering
you cannot have been fluttering
they cannot have been fluttering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I flutter?
can you flutter?
can he flutter?
can we flutter?
can you flutter?
can they flutter? 	can I be fluttering?
can you be fluttering?
can he be fluttering?
can we be fluttering?
can you be fluttering?
can they be fluttering? 	can I have fluttered?
can you have fluttered?
can he have fluttered?
can we have fluttered?
can you have fluttered?
can they have fluttered? 	can I have been fluttering?
can you have been fluttering?
can he have been fluttering?
can we have been fluttering?
can you have been fluttering?
can they have been fluttering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not flutter?
can you not flutter?
can he not flutter?
can we not flutter?
can you not flutter?
can they not flutter? 	can I not be fluttering?
can you not be fluttering?
can he not be fluttering?
can we not be fluttering?
can you not be fluttering?
can they not be fluttering? 	can I not have fluttered?
can you not have fluttered?
can he not have fluttered?
can we not have fluttered?
can you not have fluttered?
can they not have fluttered? 	can I not have been fluttering?
can you not have been fluttering?
can he not have been fluttering?
can we not have been fluttering?
can you not have been fluttering?
can they not have been fluttering?