must preexchange
Verbo regular: preexchange - preexchanged- preexchanged

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must preexchange
you must preexchange
he must preexchange
we must preexchange
you must preexchange
they must preexchange 	I must be preexchanging
you must be preexchanging
he must be preexchanging
we must be preexchanging
you must be preexchanging
they must be preexchanging	I must have preexchanged
you must have preexchanged
he must have preexchanged
we must have preexchanged
you must have preexchanged
they must have preexchanged	I must have been preexchanging
you must have been preexchanging
he must have been preexchanging
we must have been preexchanging
you must have been preexchanging
they must have been preexchanging	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not preexchange
you must not preexchange
he must not preexchange
we must not preexchange
you must not preexchange
they must not preexchange 	I must not be preexchanging
you must not be preexchanging
he must not be preexchanging
we must not be preexchanging
you must not be preexchanging
they must not be preexchanging	I must not have preexchanged
you must not have preexchanged
he must not have preexchanged
we must not have preexchanged
you must not have preexchanged
they must not have preexchanged	I must not have been preexchanging
you must not have been preexchanging
he must not have been preexchanging
we must not have been preexchanging
you must not have been preexchanging
they must not have been preexchanging	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I preexchange?
must you preexchange?
must he preexchange?
must we preexchange?
must you preexchange?
must they preexchange? 	must I be preexchanging?
must you be preexchanging?
must he be preexchanging?
must we be preexchanging?
must you be preexchanging?
must they be preexchanging? 	must I have preexchanged?
must you have preexchanged?
must he have preexchanged?
must we have preexchanged?
must you have preexchanged?
must they have preexchanged? 	must I have been preexchanging?
must you have been preexchanging?
must he have been preexchanging?
must we have been preexchanging?
must you have been preexchanging?
must they have been preexchanging? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not preexchange?
must you not preexchange?
must he not preexchange?
must we not preexchange?
must you not preexchange?
must they not preexchange? 	must I not be preexchanging?
must you not be preexchanging?
must he not be preexchanging?
must we not be preexchanging?
must you not be preexchanging?
must they not be preexchanging? 	must I not have preexchanged?
must you not have preexchanged?
must he not have preexchanged?
must we not have preexchanged?
must you not have preexchanged?
must they not have preexchanged? 	must I not have been preexchanging?
must you not have been preexchanging?
must he not have been preexchanging?
must we not have been preexchanging?
must you not have been preexchanging?
must they not have been preexchanging?