must reason
Regular verb: reason - reasoned- reasoned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must reason
you must reason
she must reason
we must reason
you must reason
they must reason 	I must be reasoning
you must be reasoning
she must be reasoning
we must be reasoning
you must be reasoning
they must be reasoning	I must have reasoned
you must have reasoned
she must have reasoned
we must have reasoned
you must have reasoned
they must have reasoned	I must have been reasoning
you must have been reasoning
she must have been reasoning
we must have been reasoning
you must have been reasoning
they must have been reasoning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't reason
you mustn't reason
she mustn't reason
we mustn't reason
you mustn't reason
they mustn't reason 	I mustn't be reasoning
you mustn't be reasoning
she mustn't be reasoning
we mustn't be reasoning
you mustn't be reasoning
they mustn't be reasoning	I mustn't have reasoned
you mustn't have reasoned
she mustn't have reasoned
we mustn't have reasoned
you mustn't have reasoned
they mustn't have reasoned	I mustn't have been reasoning
you mustn't have been reasoning
she mustn't have been reasoning
we mustn't have been reasoning
you mustn't have been reasoning
they mustn't have been reasoning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I reason?
must you reason?
must she reason?
must we reason?
must you reason?
must they reason? 	must I be reasoning?
must you be reasoning?
must she be reasoning?
must we be reasoning?
must you be reasoning?
must they be reasoning? 	must I have reasoned?
must you have reasoned?
must she have reasoned?
must we have reasoned?
must you have reasoned?
must they have reasoned? 	must I have been reasoning?
must you have been reasoning?
must she have been reasoning?
must we have been reasoning?
must you have been reasoning?
must they have been reasoning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I reason?
mustn't you reason?
mustn't she reason?
mustn't we reason?
mustn't you reason?
mustn't they reason? 	mustn't I be reasoning?
mustn't you be reasoning?
mustn't she be reasoning?
mustn't we be reasoning?
mustn't you be reasoning?
mustn't they be reasoning? 	mustn't I have reasoned?
mustn't you have reasoned?
mustn't she have reasoned?
mustn't we have reasoned?
mustn't you have reasoned?
mustn't they have reasoned? 	mustn't I have been reasoning?
mustn't you have been reasoning?
mustn't she have been reasoning?
mustn't we have been reasoning?
mustn't you have been reasoning?
mustn't they have been reasoning?