must scale
Verbo regular: scale - scaled- scaled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must scale
you must scale
he must scale
we must scale
you must scale
they must scale 	I must be scaling
you must be scaling
he must be scaling
we must be scaling
you must be scaling
they must be scaling	I must have scaled
you must have scaled
he must have scaled
we must have scaled
you must have scaled
they must have scaled	I must have been scaling
you must have been scaling
he must have been scaling
we must have been scaling
you must have been scaling
they must have been scaling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not scale
you must not scale
he must not scale
we must not scale
you must not scale
they must not scale 	I must not be scaling
you must not be scaling
he must not be scaling
we must not be scaling
you must not be scaling
they must not be scaling	I must not have scaled
you must not have scaled
he must not have scaled
we must not have scaled
you must not have scaled
they must not have scaled	I must not have been scaling
you must not have been scaling
he must not have been scaling
we must not have been scaling
you must not have been scaling
they must not have been scaling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I scale?
must you scale?
must he scale?
must we scale?
must you scale?
must they scale? 	must I be scaling?
must you be scaling?
must he be scaling?
must we be scaling?
must you be scaling?
must they be scaling? 	must I have scaled?
must you have scaled?
must he have scaled?
must we have scaled?
must you have scaled?
must they have scaled? 	must I have been scaling?
must you have been scaling?
must he have been scaling?
must we have been scaling?
must you have been scaling?
must they have been scaling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not scale?
must you not scale?
must he not scale?
must we not scale?
must you not scale?
must they not scale? 	must I not be scaling?
must you not be scaling?
must he not be scaling?
must we not be scaling?
must you not be scaling?
must they not be scaling? 	must I not have scaled?
must you not have scaled?
must he not have scaled?
must we not have scaled?
must you not have scaled?
must they not have scaled? 	must I not have been scaling?
must you not have been scaling?
must he not have been scaling?
must we not have been scaling?
must you not have been scaling?
must they not have been scaling?