must preestablish
Verbo regular: preestablish - preestablished- preestablished

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must preestablish
you must preestablish
he must preestablish
we must preestablish
you must preestablish
they must preestablish 	I must be preestablishing
you must be preestablishing
he must be preestablishing
we must be preestablishing
you must be preestablishing
they must be preestablishing	I must have preestablished
you must have preestablished
he must have preestablished
we must have preestablished
you must have preestablished
they must have preestablished	I must have been preestablishing
you must have been preestablishing
he must have been preestablishing
we must have been preestablishing
you must have been preestablishing
they must have been preestablishing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not preestablish
you must not preestablish
he must not preestablish
we must not preestablish
you must not preestablish
they must not preestablish 	I must not be preestablishing
you must not be preestablishing
he must not be preestablishing
we must not be preestablishing
you must not be preestablishing
they must not be preestablishing	I must not have preestablished
you must not have preestablished
he must not have preestablished
we must not have preestablished
you must not have preestablished
they must not have preestablished	I must not have been preestablishing
you must not have been preestablishing
he must not have been preestablishing
we must not have been preestablishing
you must not have been preestablishing
they must not have been preestablishing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I preestablish?
must you preestablish?
must he preestablish?
must we preestablish?
must you preestablish?
must they preestablish? 	must I be preestablishing?
must you be preestablishing?
must he be preestablishing?
must we be preestablishing?
must you be preestablishing?
must they be preestablishing? 	must I have preestablished?
must you have preestablished?
must he have preestablished?
must we have preestablished?
must you have preestablished?
must they have preestablished? 	must I have been preestablishing?
must you have been preestablishing?
must he have been preestablishing?
must we have been preestablishing?
must you have been preestablishing?
must they have been preestablishing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not preestablish?
must you not preestablish?
must he not preestablish?
must we not preestablish?
must you not preestablish?
must they not preestablish? 	must I not be preestablishing?
must you not be preestablishing?
must he not be preestablishing?
must we not be preestablishing?
must you not be preestablishing?
must they not be preestablishing? 	must I not have preestablished?
must you not have preestablished?
must he not have preestablished?
must we not have preestablished?
must you not have preestablished?
must they not have preestablished? 	must I not have been preestablishing?
must you not have been preestablishing?
must he not have been preestablishing?
must we not have been preestablishing?
must you not have been preestablishing?
must they not have been preestablishing?