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 must not reason you must not reason he must not reason we must not reason you must not reason they must not reason
V-ing form
I must not be reasoning you must not be reasoning he must not be reasoning we must not be reasoning you must not be reasoning they must not be reasoning
Perfect
I must not have reasoned you must not have reasoned he must not have reasoned we must not have reasoned you must not have reasoned they must not have reasoned
V-ing perfect
I must not have been reasoning you must not have been reasoning he must not have been reasoning we must not have been reasoning you must not have been reasoning they must not 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
must I not reason? must you not reason? must he not reason? must we not reason? must you not reason? must they not reason?
V-ing form
must I not be reasoning? must you not be reasoning? must he not be reasoning? must we not be reasoning? must you not be reasoning? must they not be reasoning?
Perfect
must I not have reasoned? must you not have reasoned? must he not have reasoned? must we not have reasoned? must you not have reasoned? must they not have reasoned?
V-ing perfect
must I not have been reasoning? must you not have been reasoning? must he not have been reasoning? must we not have been reasoning? must you not have been reasoning? must they not have been reasoning?