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