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 must not untack
you must not untack
he must not untack
we must not untack
you must not untack
they must not untack 	I must not be untacking
you must not be untacking
he must not be untacking
we must not be untacking
you must not be untacking
they must not be untacking	I must not have untacked
you must not have untacked
he must not have untacked
we must not have untacked
you must not have untacked
they must not have untacked	I must not have been untacking
you must not have been untacking
he must not have been untacking
we must not have been untacking
you must not have been untacking
they must not 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 	
must I not untack?
must you not untack?
must he not untack?
must we not untack?
must you not untack?
must they not untack? 	must I not be untacking?
must you not be untacking?
must he not be untacking?
must we not be untacking?
must you not be untacking?
must they not be untacking? 	must I not have untacked?
must you not have untacked?
must he not have untacked?
must we not have untacked?
must you not have untacked?
must they not have untacked? 	must I not have been untacking?
must you not have been untacking?
must he not have been untacking?
must we not have been untacking?
must you not have been untacking?
must they not have been untacking?