must krass
Verbo regular: krass - krassed- krassed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must krass
you must krass
he must krass
we must krass
you must krass
they must krass 	I must be krassing
you must be krassing
he must be krassing
we must be krassing
you must be krassing
they must be krassing	I must have krassed
you must have krassed
he must have krassed
we must have krassed
you must have krassed
they must have krassed	I must have been krassing
you must have been krassing
he must have been krassing
we must have been krassing
you must have been krassing
they must have been krassing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not krass
you must not krass
he must not krass
we must not krass
you must not krass
they must not krass 	I must not be krassing
you must not be krassing
he must not be krassing
we must not be krassing
you must not be krassing
they must not be krassing	I must not have krassed
you must not have krassed
he must not have krassed
we must not have krassed
you must not have krassed
they must not have krassed	I must not have been krassing
you must not have been krassing
he must not have been krassing
we must not have been krassing
you must not have been krassing
they must not have been krassing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I krass?
must you krass?
must he krass?
must we krass?
must you krass?
must they krass? 	must I be krassing?
must you be krassing?
must he be krassing?
must we be krassing?
must you be krassing?
must they be krassing? 	must I have krassed?
must you have krassed?
must he have krassed?
must we have krassed?
must you have krassed?
must they have krassed? 	must I have been krassing?
must you have been krassing?
must he have been krassing?
must we have been krassing?
must you have been krassing?
must they have been krassing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not krass?
must you not krass?
must he not krass?
must we not krass?
must you not krass?
must they not krass? 	must I not be krassing?
must you not be krassing?
must he not be krassing?
must we not be krassing?
must you not be krassing?
must they not be krassing? 	must I not have krassed?
must you not have krassed?
must he not have krassed?
must we not have krassed?
must you not have krassed?
must they not have krassed? 	must I not have been krassing?
must you not have been krassing?
must he not have been krassing?
must we not have been krassing?
must you not have been krassing?
must they not have been krassing?