must function
Verbo regular: function - functioned- functioned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must function
you must function
he must function
we must function
you must function
they must function 	I must be functioning
you must be functioning
he must be functioning
we must be functioning
you must be functioning
they must be functioning	I must have functioned
you must have functioned
he must have functioned
we must have functioned
you must have functioned
they must have functioned	I must have been functioning
you must have been functioning
he must have been functioning
we must have been functioning
you must have been functioning
they must have been functioning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not function
you must not function
he must not function
we must not function
you must not function
they must not function 	I must not be functioning
you must not be functioning
he must not be functioning
we must not be functioning
you must not be functioning
they must not be functioning	I must not have functioned
you must not have functioned
he must not have functioned
we must not have functioned
you must not have functioned
they must not have functioned	I must not have been functioning
you must not have been functioning
he must not have been functioning
we must not have been functioning
you must not have been functioning
they must not have been functioning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I function?
must you function?
must he function?
must we function?
must you function?
must they function? 	must I be functioning?
must you be functioning?
must he be functioning?
must we be functioning?
must you be functioning?
must they be functioning? 	must I have functioned?
must you have functioned?
must he have functioned?
must we have functioned?
must you have functioned?
must they have functioned? 	must I have been functioning?
must you have been functioning?
must he have been functioning?
must we have been functioning?
must you have been functioning?
must they have been functioning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not function?
must you not function?
must he not function?
must we not function?
must you not function?
must they not function? 	must I not be functioning?
must you not be functioning?
must he not be functioning?
must we not be functioning?
must you not be functioning?
must they not be functioning? 	must I not have functioned?
must you not have functioned?
must he not have functioned?
must we not have functioned?
must you not have functioned?
must they not have functioned? 	must I not have been functioning?
must you not have been functioning?
must he not have been functioning?
must we not have been functioning?
must you not have been functioning?
must they not have been functioning?