must reason
Verbo regular: reason - reasoned- reasoned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must reason
you must reason
he must reason
we must reason
you must reason
they must reason 	I must be reasoning
you must be reasoning
he must be reasoning
we must be reasoning
you must be reasoning
they must be reasoning	I must have reasoned
you must have reasoned
he 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
he must have been reasoning
we must have been reasoning
you must have been reasoning
they must have been reasoning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not reason
you must not reason
he must not reason
we must not reason
you must not reason
they must not reason 	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	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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I reason?
must you reason?
must he reason?
must we reason?
must you reason?
must they reason? 	must I be reasoning?
must you be reasoning?
must he be reasoning?
must we be reasoning?
must you be reasoning?
must they be reasoning? 	must I have reasoned?
must you have reasoned?
must he 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 he have been reasoning?
must we have been reasoning?
must you have been reasoning?
must they have been reasoning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not reason?
must you not reason?
must he not reason?
must we not reason?
must you not reason?
must they not reason? 	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? 	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? 	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?