must preexist
Verbo regular: preexist - preexisted- preexisted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must preexist
you must preexist
he must preexist
we must preexist
you must preexist
they must preexist 	I must be preexisting
you must be preexisting
he must be preexisting
we must be preexisting
you must be preexisting
they must be preexisting	I must have preexisted
you must have preexisted
he must have preexisted
we must have preexisted
you must have preexisted
they must have preexisted	I must have been preexisting
you must have been preexisting
he must have been preexisting
we must have been preexisting
you must have been preexisting
they must have been preexisting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not preexist
you must not preexist
he must not preexist
we must not preexist
you must not preexist
they must not preexist 	I must not be preexisting
you must not be preexisting
he must not be preexisting
we must not be preexisting
you must not be preexisting
they must not be preexisting	I must not have preexisted
you must not have preexisted
he must not have preexisted
we must not have preexisted
you must not have preexisted
they must not have preexisted	I must not have been preexisting
you must not have been preexisting
he must not have been preexisting
we must not have been preexisting
you must not have been preexisting
they must not have been preexisting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I preexist?
must you preexist?
must he preexist?
must we preexist?
must you preexist?
must they preexist? 	must I be preexisting?
must you be preexisting?
must he be preexisting?
must we be preexisting?
must you be preexisting?
must they be preexisting? 	must I have preexisted?
must you have preexisted?
must he have preexisted?
must we have preexisted?
must you have preexisted?
must they have preexisted? 	must I have been preexisting?
must you have been preexisting?
must he have been preexisting?
must we have been preexisting?
must you have been preexisting?
must they have been preexisting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not preexist?
must you not preexist?
must he not preexist?
must we not preexist?
must you not preexist?
must they not preexist? 	must I not be preexisting?
must you not be preexisting?
must he not be preexisting?
must we not be preexisting?
must you not be preexisting?
must they not be preexisting? 	must I not have preexisted?
must you not have preexisted?
must he not have preexisted?
must we not have preexisted?
must you not have preexisted?
must they not have preexisted? 	must I not have been preexisting?
must you not have been preexisting?
must he not have been preexisting?
must we not have been preexisting?
must you not have been preexisting?
must they not have been preexisting?