must besiege
Regular verb: besiege - besieged- besieged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must besiege
you must besiege
he must besiege
we must besiege
you must besiege
they must besiege 	I must be besieging
you must be besieging
he must be besieging
we must be besieging
you must be besieging
they must be besieging	I must have besieged
you must have besieged
he 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
he 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
he 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
he 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
he 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
he 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 he besiege?
must we besiege?
must you besiege?
must they besiege? 	must I be besieging?
must you be besieging?
must he be besieging?
must we be besieging?
must you be besieging?
must they be besieging? 	must I have besieged?
must you have besieged?
must he 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 he 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 he 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 he 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 he 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 he have been besieging?
mustn't we have been besieging?
mustn't you have been besieging?
mustn't they have been besieging?