must untangle
Regular verb: untangle - untangled- untangled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must untangle
you must untangle
he must untangle
we must untangle
you must untangle
they must untangle 	I must be untangling
you must be untangling
he must be untangling
we must be untangling
you must be untangling
they must be untangling	I must have untangled
you must have untangled
he must have untangled
we must have untangled
you must have untangled
they must have untangled	I must have been untangling
you must have been untangling
he must have been untangling
we must have been untangling
you must have been untangling
they must have been untangling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not untangle
you must not untangle
he must not untangle
we must not untangle
you must not untangle
they must not untangle 	I must not be untangling
you must not be untangling
he must not be untangling
we must not be untangling
you must not be untangling
they must not be untangling	I must not have untangled
you must not have untangled
he must not have untangled
we must not have untangled
you must not have untangled
they must not have untangled	I must not have been untangling
you must not have been untangling
he must not have been untangling
we must not have been untangling
you must not have been untangling
they must not have been untangling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I untangle?
must you untangle?
must he untangle?
must we untangle?
must you untangle?
must they untangle? 	must I be untangling?
must you be untangling?
must he be untangling?
must we be untangling?
must you be untangling?
must they be untangling? 	must I have untangled?
must you have untangled?
must he have untangled?
must we have untangled?
must you have untangled?
must they have untangled? 	must I have been untangling?
must you have been untangling?
must he have been untangling?
must we have been untangling?
must you have been untangling?
must they have been untangling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not untangle?
must you not untangle?
must he not untangle?
must we not untangle?
must you not untangle?
must they not untangle? 	must I not be untangling?
must you not be untangling?
must he not be untangling?
must we not be untangling?
must you not be untangling?
must they not be untangling? 	must I not have untangled?
must you not have untangled?
must he not have untangled?
must we not have untangled?
must you not have untangled?
must they not have untangled? 	must I not have been untangling?
must you not have been untangling?
must he not have been untangling?
must we not have been untangling?
must you not have been untangling?
must they not have been untangling?