must overharden
Verbo regular: overharden - overhardened- overhardened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must overharden
you must overharden
he must overharden
we must overharden
you must overharden
they must overharden 	I must be overhardening
you must be overhardening
he must be overhardening
we must be overhardening
you must be overhardening
they must be overhardening	I must have overhardened
you must have overhardened
he must have overhardened
we must have overhardened
you must have overhardened
they must have overhardened	I must have been overhardening
you must have been overhardening
he must have been overhardening
we must have been overhardening
you must have been overhardening
they must have been overhardening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't overharden
you mustn't overharden
he mustn't overharden
we mustn't overharden
you mustn't overharden
they mustn't overharden 	I mustn't be overhardening
you mustn't be overhardening
he mustn't be overhardening
we mustn't be overhardening
you mustn't be overhardening
they mustn't be overhardening	I mustn't have overhardened
you mustn't have overhardened
he mustn't have overhardened
we mustn't have overhardened
you mustn't have overhardened
they mustn't have overhardened	I mustn't have been overhardening
you mustn't have been overhardening
he mustn't have been overhardening
we mustn't have been overhardening
you mustn't have been overhardening
they mustn't have been overhardening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I overharden?
must you overharden?
must he overharden?
must we overharden?
must you overharden?
must they overharden? 	must I be overhardening?
must you be overhardening?
must he be overhardening?
must we be overhardening?
must you be overhardening?
must they be overhardening? 	must I have overhardened?
must you have overhardened?
must he have overhardened?
must we have overhardened?
must you have overhardened?
must they have overhardened? 	must I have been overhardening?
must you have been overhardening?
must he have been overhardening?
must we have been overhardening?
must you have been overhardening?
must they have been overhardening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I overharden?
mustn't you overharden?
mustn't he overharden?
mustn't we overharden?
mustn't you overharden?
mustn't they overharden? 	mustn't I be overhardening?
mustn't you be overhardening?
mustn't he be overhardening?
mustn't we be overhardening?
mustn't you be overhardening?
mustn't they be overhardening? 	mustn't I have overhardened?
mustn't you have overhardened?
mustn't he have overhardened?
mustn't we have overhardened?
mustn't you have overhardened?
mustn't they have overhardened? 	mustn't I have been overhardening?
mustn't you have been overhardening?
mustn't he have been overhardening?
mustn't we have been overhardening?
mustn't you have been overhardening?
mustn't they have been overhardening?