must untuck
Regular verb: untuck - untucked- untucked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must untuck
you must untuck
he must untuck
we must untuck
you must untuck
they must untuck 	I must be untucking
you must be untucking
he must be untucking
we must be untucking
you must be untucking
they must be untucking	I must have untucked
you must have untucked
he must have untucked
we must have untucked
you must have untucked
they must have untucked	I must have been untucking
you must have been untucking
he must have been untucking
we must have been untucking
you must have been untucking
they must have been untucking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't untuck
you mustn't untuck
he mustn't untuck
we mustn't untuck
you mustn't untuck
they mustn't untuck 	I mustn't be untucking
you mustn't be untucking
he mustn't be untucking
we mustn't be untucking
you mustn't be untucking
they mustn't be untucking	I mustn't have untucked
you mustn't have untucked
he mustn't have untucked
we mustn't have untucked
you mustn't have untucked
they mustn't have untucked	I mustn't have been untucking
you mustn't have been untucking
he mustn't have been untucking
we mustn't have been untucking
you mustn't have been untucking
they mustn't have been untucking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I untuck?
must you untuck?
must he untuck?
must we untuck?
must you untuck?
must they untuck? 	must I be untucking?
must you be untucking?
must he be untucking?
must we be untucking?
must you be untucking?
must they be untucking? 	must I have untucked?
must you have untucked?
must he have untucked?
must we have untucked?
must you have untucked?
must they have untucked? 	must I have been untucking?
must you have been untucking?
must he have been untucking?
must we have been untucking?
must you have been untucking?
must they have been untucking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I untuck?
mustn't you untuck?
mustn't he untuck?
mustn't we untuck?
mustn't you untuck?
mustn't they untuck? 	mustn't I be untucking?
mustn't you be untucking?
mustn't he be untucking?
mustn't we be untucking?
mustn't you be untucking?
mustn't they be untucking? 	mustn't I have untucked?
mustn't you have untucked?
mustn't he have untucked?
mustn't we have untucked?
mustn't you have untucked?
mustn't they have untucked? 	mustn't I have been untucking?
mustn't you have been untucking?
mustn't he have been untucking?
mustn't we have been untucking?
mustn't you have been untucking?
mustn't they have been untucking?