could flutter
Regular verb: flutter - fluttered- fluttered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't flutter
you couldn't flutter
he couldn't flutter
we couldn't flutter
you couldn't flutter
they couldn't flutter 	I couldn't be fluttering
you couldn't be fluttering
he couldn't be fluttering
we couldn't be fluttering
you couldn't be fluttering
they couldn't be fluttering	I couldn't have fluttered
you couldn't have fluttered
he couldn't have fluttered
we couldn't have fluttered
you couldn't have fluttered
they couldn't have fluttered	I couldn't have been fluttering
you couldn't have been fluttering
he couldn't have been fluttering
we couldn't have been fluttering
you couldn't have been fluttering
they couldn't have been fluttering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I flutter?
couldn't you flutter?
couldn't he flutter?
couldn't we flutter?
couldn't you flutter?
couldn't they flutter? 	couldn't I be fluttering?
couldn't you be fluttering?
couldn't he be fluttering?
couldn't we be fluttering?
couldn't you be fluttering?
couldn't they be fluttering? 	couldn't I have fluttered?
couldn't you have fluttered?
couldn't he have fluttered?
couldn't we have fluttered?
couldn't you have fluttered?
couldn't they have fluttered? 	couldn't I have been fluttering?
couldn't you have been fluttering?
couldn't he have been fluttering?
couldn't we have been fluttering?
couldn't you have been fluttering?
couldn't they have been fluttering?