could flutter
Regular verb: flutter - fluttered- fluttered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could flutter
you could flutter
she could flutter
we could flutter
you could flutter
they could flutter 	I could be fluttering
you could be fluttering
she could be fluttering
we could be fluttering
you could be fluttering
they could be fluttering	I could have fluttered
you could have fluttered
she 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
she 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 could not flutter
you could not flutter
she 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
she 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
she 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
she could not have been fluttering
we could not have been fluttering
you could not have been fluttering
they could not have been fluttering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I flutter?
could you flutter?
could she flutter?
could we flutter?
could you flutter?
could they flutter? 	could I be fluttering?
could you be fluttering?
could she be fluttering?
could we be fluttering?
could you be fluttering?
could they be fluttering? 	could I have fluttered?
could you have fluttered?
could she 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 she 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 	
could I not flutter?
could you not flutter?
could she 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 she 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 she 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 she not have been fluttering?
could we not have been fluttering?
could you not have been fluttering?
could they not have been fluttering?