must untack
Verbe régulier : untack - untacked- untacked

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must untack
you must untack
he must untack
we must untack
you must untack
they must untack 	I must be untacking
you must be untacking
he must be untacking
we must be untacking
you must be untacking
they must be untacking	I must have untacked
you must have untacked
he must have untacked
we must have untacked
you must have untacked
they must have untacked	I must have been untacking
you must have been untacking
he must have been untacking
we must have been untacking
you must have been untacking
they must have been untacking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't untack
you mustn't untack
he mustn't untack
we mustn't untack
you mustn't untack
they mustn't untack 	I mustn't be untacking
you mustn't be untacking
he mustn't be untacking
we mustn't be untacking
you mustn't be untacking
they mustn't be untacking	I mustn't have untacked
you mustn't have untacked
he mustn't have untacked
we mustn't have untacked
you mustn't have untacked
they mustn't have untacked	I mustn't have been untacking
you mustn't have been untacking
he mustn't have been untacking
we mustn't have been untacking
you mustn't have been untacking
they mustn't have been untacking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I untack?
must you untack?
must he untack?
must we untack?
must you untack?
must they untack? 	must I be untacking?
must you be untacking?
must he be untacking?
must we be untacking?
must you be untacking?
must they be untacking? 	must I have untacked?
must you have untacked?
must he have untacked?
must we have untacked?
must you have untacked?
must they have untacked? 	must I have been untacking?
must you have been untacking?
must he have been untacking?
must we have been untacking?
must you have been untacking?
must they have been untacking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I untack?
mustn't you untack?
mustn't he untack?
mustn't we untack?
mustn't you untack?
mustn't they untack? 	mustn't I be untacking?
mustn't you be untacking?
mustn't he be untacking?
mustn't we be untacking?
mustn't you be untacking?
mustn't they be untacking? 	mustn't I have untacked?
mustn't you have untacked?
mustn't he have untacked?
mustn't we have untacked?
mustn't you have untacked?
mustn't they have untacked? 	mustn't I have been untacking?
mustn't you have been untacking?
mustn't he have been untacking?
mustn't we have been untacking?
mustn't you have been untacking?
mustn't they have been untacking?