must preharden
Verbo regular: preharden - prehardened- prehardened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must preharden
you must preharden
he must preharden
we must preharden
you must preharden
they must preharden 	I must be prehardening
you must be prehardening
he must be prehardening
we must be prehardening
you must be prehardening
they must be prehardening	I must have prehardened
you must have prehardened
he must have prehardened
we must have prehardened
you must have prehardened
they must have prehardened	I must have been prehardening
you must have been prehardening
he must have been prehardening
we must have been prehardening
you must have been prehardening
they must have been prehardening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not preharden
you must not preharden
he must not preharden
we must not preharden
you must not preharden
they must not preharden 	I must not be prehardening
you must not be prehardening
he must not be prehardening
we must not be prehardening
you must not be prehardening
they must not be prehardening	I must not have prehardened
you must not have prehardened
he must not have prehardened
we must not have prehardened
you must not have prehardened
they must not have prehardened	I must not have been prehardening
you must not have been prehardening
he must not have been prehardening
we must not have been prehardening
you must not have been prehardening
they must not have been prehardening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I preharden?
must you preharden?
must he preharden?
must we preharden?
must you preharden?
must they preharden? 	must I be prehardening?
must you be prehardening?
must he be prehardening?
must we be prehardening?
must you be prehardening?
must they be prehardening? 	must I have prehardened?
must you have prehardened?
must he have prehardened?
must we have prehardened?
must you have prehardened?
must they have prehardened? 	must I have been prehardening?
must you have been prehardening?
must he have been prehardening?
must we have been prehardening?
must you have been prehardening?
must they have been prehardening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not preharden?
must you not preharden?
must he not preharden?
must we not preharden?
must you not preharden?
must they not preharden? 	must I not be prehardening?
must you not be prehardening?
must he not be prehardening?
must we not be prehardening?
must you not be prehardening?
must they not be prehardening? 	must I not have prehardened?
must you not have prehardened?
must he not have prehardened?
must we not have prehardened?
must you not have prehardened?
must they not have prehardened? 	must I not have been prehardening?
must you not have been prehardening?
must he not have been prehardening?
must we not have been prehardening?
must you not have been prehardening?
must they not have been prehardening?