must flutter
Regular verb: flutter - fluttered- fluttered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must flutter
you must flutter
she must flutter
we must flutter
you must flutter
they must flutter 	I must be fluttering
you must be fluttering
she must be fluttering
we must be fluttering
you must be fluttering
they must be fluttering	I must have fluttered
you must have fluttered
she must have fluttered
we must have fluttered
you must have fluttered
they must have fluttered	I must have been fluttering
you must have been fluttering
she must have been fluttering
we must have been fluttering
you must have been fluttering
they must have been fluttering	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I flutter?
must you flutter?
must she flutter?
must we flutter?
must you flutter?
must they flutter? 	must I be fluttering?
must you be fluttering?
must she be fluttering?
must we be fluttering?
must you be fluttering?
must they be fluttering? 	must I have fluttered?
must you have fluttered?
must she have fluttered?
must we have fluttered?
must you have fluttered?
must they have fluttered? 	must I have been fluttering?
must you have been fluttering?
must she have been fluttering?
must we have been fluttering?
must you have been fluttering?
must they have been fluttering? 	

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