must besiege
Regular verb: besiege - besieged- besieged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must besiege
you must besiege
she must besiege
we must besiege
you must besiege
they must besiege 	I must be besieging
you must be besieging
she must be besieging
we must be besieging
you must be besieging
they must be besieging	I must have besieged
you must have besieged
she must have besieged
we must have besieged
you must have besieged
they must have besieged	I must have been besieging
you must have been besieging
she must have been besieging
we must have been besieging
you must have been besieging
they must have been besieging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't besiege
you mustn't besiege
she mustn't besiege
we mustn't besiege
you mustn't besiege
they mustn't besiege 	I mustn't be besieging
you mustn't be besieging
she mustn't be besieging
we mustn't be besieging
you mustn't be besieging
they mustn't be besieging	I mustn't have besieged
you mustn't have besieged
she mustn't have besieged
we mustn't have besieged
you mustn't have besieged
they mustn't have besieged	I mustn't have been besieging
you mustn't have been besieging
she mustn't have been besieging
we mustn't have been besieging
you mustn't have been besieging
they mustn't have been besieging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I besiege?
must you besiege?
must she besiege?
must we besiege?
must you besiege?
must they besiege? 	must I be besieging?
must you be besieging?
must she be besieging?
must we be besieging?
must you be besieging?
must they be besieging? 	must I have besieged?
must you have besieged?
must she have besieged?
must we have besieged?
must you have besieged?
must they have besieged? 	must I have been besieging?
must you have been besieging?
must she have been besieging?
must we have been besieging?
must you have been besieging?
must they have been besieging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I besiege?
mustn't you besiege?
mustn't she besiege?
mustn't we besiege?
mustn't you besiege?
mustn't they besiege? 	mustn't I be besieging?
mustn't you be besieging?
mustn't she be besieging?
mustn't we be besieging?
mustn't you be besieging?
mustn't they be besieging? 	mustn't I have besieged?
mustn't you have besieged?
mustn't she have besieged?
mustn't we have besieged?
mustn't you have besieged?
mustn't they have besieged? 	mustn't I have been besieging?
mustn't you have been besieging?
mustn't she have been besieging?
mustn't we have been besieging?
mustn't you have been besieging?
mustn't they have been besieging?