must krass
Verbe régulier : krass - krassed- krassed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en 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	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't krass
you mustn't krass
he mustn't krass
we mustn't krass
you mustn't krass
they mustn't krass 	I mustn't be krassing
you mustn't be krassing
he mustn't be krassing
we mustn't be krassing
you mustn't be krassing
they mustn't be krassing	I mustn't have krassed
you mustn't have krassed
he mustn't have krassed
we mustn't have krassed
you mustn't have krassed
they mustn't have krassed	I mustn't have been krassing
you mustn't have been krassing
he mustn't have been krassing
we mustn't have been krassing
you mustn't have been krassing
they mustn't have been krassing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en 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? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I krass?
mustn't you krass?
mustn't he krass?
mustn't we krass?
mustn't you krass?
mustn't they krass? 	mustn't I be krassing?
mustn't you be krassing?
mustn't he be krassing?
mustn't we be krassing?
mustn't you be krassing?
mustn't they be krassing? 	mustn't I have krassed?
mustn't you have krassed?
mustn't he have krassed?
mustn't we have krassed?
mustn't you have krassed?
mustn't they have krassed? 	mustn't I have been krassing?
mustn't you have been krassing?
mustn't he have been krassing?
mustn't we have been krassing?
mustn't you have been krassing?
mustn't they have been krassing?