must uncurl
Regular verb: uncurl - uncurled- uncurled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must uncurl
you must uncurl
he must uncurl
we must uncurl
you must uncurl
they must uncurl 	I must be uncurling
you must be uncurling
he must be uncurling
we must be uncurling
you must be uncurling
they must be uncurling	I must have uncurled
you must have uncurled
he must have uncurled
we must have uncurled
you must have uncurled
they must have uncurled	I must have been uncurling
you must have been uncurling
he must have been uncurling
we must have been uncurling
you must have been uncurling
they must have been uncurling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't uncurl
you mustn't uncurl
he mustn't uncurl
we mustn't uncurl
you mustn't uncurl
they mustn't uncurl 	I mustn't be uncurling
you mustn't be uncurling
he mustn't be uncurling
we mustn't be uncurling
you mustn't be uncurling
they mustn't be uncurling	I mustn't have uncurled
you mustn't have uncurled
he mustn't have uncurled
we mustn't have uncurled
you mustn't have uncurled
they mustn't have uncurled	I mustn't have been uncurling
you mustn't have been uncurling
he mustn't have been uncurling
we mustn't have been uncurling
you mustn't have been uncurling
they mustn't have been uncurling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I uncurl?
must you uncurl?
must he uncurl?
must we uncurl?
must you uncurl?
must they uncurl? 	must I be uncurling?
must you be uncurling?
must he be uncurling?
must we be uncurling?
must you be uncurling?
must they be uncurling? 	must I have uncurled?
must you have uncurled?
must he have uncurled?
must we have uncurled?
must you have uncurled?
must they have uncurled? 	must I have been uncurling?
must you have been uncurling?
must he have been uncurling?
must we have been uncurling?
must you have been uncurling?
must they have been uncurling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I uncurl?
mustn't you uncurl?
mustn't he uncurl?
mustn't we uncurl?
mustn't you uncurl?
mustn't they uncurl? 	mustn't I be uncurling?
mustn't you be uncurling?
mustn't he be uncurling?
mustn't we be uncurling?
mustn't you be uncurling?
mustn't they be uncurling? 	mustn't I have uncurled?
mustn't you have uncurled?
mustn't he have uncurled?
mustn't we have uncurled?
mustn't you have uncurled?
mustn't they have uncurled? 	mustn't I have been uncurling?
mustn't you have been uncurling?
mustn't he have been uncurling?
mustn't we have been uncurling?
mustn't you have been uncurling?
mustn't they have been uncurling?