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 must not flutter
you must not flutter
she must not flutter
we must not flutter
you must not flutter
they must not flutter 	I must not be fluttering
you must not be fluttering
she must not be fluttering
we must not be fluttering
you must not be fluttering
they must not be fluttering	I must not have fluttered
you must not have fluttered
she must not have fluttered
we must not have fluttered
you must not have fluttered
they must not have fluttered	I must not have been fluttering
you must not have been fluttering
she must not have been fluttering
we must not have been fluttering
you must not have been fluttering
they must not 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 	
must I not flutter?
must you not flutter?
must she not flutter?
must we not flutter?
must you not flutter?
must they not flutter? 	must I not be fluttering?
must you not be fluttering?
must she not be fluttering?
must we not be fluttering?
must you not be fluttering?
must they not be fluttering? 	must I not have fluttered?
must you not have fluttered?
must she not have fluttered?
must we not have fluttered?
must you not have fluttered?
must they not have fluttered? 	must I not have been fluttering?
must you not have been fluttering?
must she not have been fluttering?
must we not have been fluttering?
must you not have been fluttering?
must they not have been fluttering?