must untwine
Regular verb: untwine - untwined- untwined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must untwine
you must untwine
he must untwine
we must untwine
you must untwine
they must untwine 	I must be untwining
you must be untwining
he must be untwining
we must be untwining
you must be untwining
they must be untwining	I must have untwined
you must have untwined
he must have untwined
we must have untwined
you must have untwined
they must have untwined	I must have been untwining
you must have been untwining
he must have been untwining
we must have been untwining
you must have been untwining
they must have been untwining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't untwine
you mustn't untwine
he mustn't untwine
we mustn't untwine
you mustn't untwine
they mustn't untwine 	I mustn't be untwining
you mustn't be untwining
he mustn't be untwining
we mustn't be untwining
you mustn't be untwining
they mustn't be untwining	I mustn't have untwined
you mustn't have untwined
he mustn't have untwined
we mustn't have untwined
you mustn't have untwined
they mustn't have untwined	I mustn't have been untwining
you mustn't have been untwining
he mustn't have been untwining
we mustn't have been untwining
you mustn't have been untwining
they mustn't have been untwining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I untwine?
must you untwine?
must he untwine?
must we untwine?
must you untwine?
must they untwine? 	must I be untwining?
must you be untwining?
must he be untwining?
must we be untwining?
must you be untwining?
must they be untwining? 	must I have untwined?
must you have untwined?
must he have untwined?
must we have untwined?
must you have untwined?
must they have untwined? 	must I have been untwining?
must you have been untwining?
must he have been untwining?
must we have been untwining?
must you have been untwining?
must they have been untwining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I untwine?
mustn't you untwine?
mustn't he untwine?
mustn't we untwine?
mustn't you untwine?
mustn't they untwine? 	mustn't I be untwining?
mustn't you be untwining?
mustn't he be untwining?
mustn't we be untwining?
mustn't you be untwining?
mustn't they be untwining? 	mustn't I have untwined?
mustn't you have untwined?
mustn't he have untwined?
mustn't we have untwined?
mustn't you have untwined?
mustn't they have untwined? 	mustn't I have been untwining?
mustn't you have been untwining?
mustn't he have been untwining?
mustn't we have been untwining?
mustn't you have been untwining?
mustn't they have been untwining?