must uncouple
Regular verb: uncouple - uncoupled- uncoupled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must uncouple
you must uncouple
he must uncouple
we must uncouple
you must uncouple
they must uncouple 	I must be uncoupling
you must be uncoupling
he must be uncoupling
we must be uncoupling
you must be uncoupling
they must be uncoupling	I must have uncoupled
you must have uncoupled
he must have uncoupled
we must have uncoupled
you must have uncoupled
they must have uncoupled	I must have been uncoupling
you must have been uncoupling
he must have been uncoupling
we must have been uncoupling
you must have been uncoupling
they must have been uncoupling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't uncouple
you mustn't uncouple
he mustn't uncouple
we mustn't uncouple
you mustn't uncouple
they mustn't uncouple 	I mustn't be uncoupling
you mustn't be uncoupling
he mustn't be uncoupling
we mustn't be uncoupling
you mustn't be uncoupling
they mustn't be uncoupling	I mustn't have uncoupled
you mustn't have uncoupled
he mustn't have uncoupled
we mustn't have uncoupled
you mustn't have uncoupled
they mustn't have uncoupled	I mustn't have been uncoupling
you mustn't have been uncoupling
he mustn't have been uncoupling
we mustn't have been uncoupling
you mustn't have been uncoupling
they mustn't have been uncoupling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I uncouple?
must you uncouple?
must he uncouple?
must we uncouple?
must you uncouple?
must they uncouple? 	must I be uncoupling?
must you be uncoupling?
must he be uncoupling?
must we be uncoupling?
must you be uncoupling?
must they be uncoupling? 	must I have uncoupled?
must you have uncoupled?
must he have uncoupled?
must we have uncoupled?
must you have uncoupled?
must they have uncoupled? 	must I have been uncoupling?
must you have been uncoupling?
must he have been uncoupling?
must we have been uncoupling?
must you have been uncoupling?
must they have been uncoupling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I uncouple?
mustn't you uncouple?
mustn't he uncouple?
mustn't we uncouple?
mustn't you uncouple?
mustn't they uncouple? 	mustn't I be uncoupling?
mustn't you be uncoupling?
mustn't he be uncoupling?
mustn't we be uncoupling?
mustn't you be uncoupling?
mustn't they be uncoupling? 	mustn't I have uncoupled?
mustn't you have uncoupled?
mustn't he have uncoupled?
mustn't we have uncoupled?
mustn't you have uncoupled?
mustn't they have uncoupled? 	mustn't I have been uncoupling?
mustn't you have been uncoupling?
mustn't he have been uncoupling?
mustn't we have been uncoupling?
mustn't you have been uncoupling?
mustn't they have been uncoupling?