must decouple
Regular verb: decouple - decoupled- decoupled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must decouple
you must decouple
she must decouple
we must decouple
you must decouple
they must decouple 	I must be decoupling
you must be decoupling
she must be decoupling
we must be decoupling
you must be decoupling
they must be decoupling	I must have decoupled
you must have decoupled
she must have decoupled
we must have decoupled
you must have decoupled
they must have decoupled	I must have been decoupling
you must have been decoupling
she must have been decoupling
we must have been decoupling
you must have been decoupling
they must have been decoupling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't decouple
you mustn't decouple
she mustn't decouple
we mustn't decouple
you mustn't decouple
they mustn't decouple 	I mustn't be decoupling
you mustn't be decoupling
she mustn't be decoupling
we mustn't be decoupling
you mustn't be decoupling
they mustn't be decoupling	I mustn't have decoupled
you mustn't have decoupled
she mustn't have decoupled
we mustn't have decoupled
you mustn't have decoupled
they mustn't have decoupled	I mustn't have been decoupling
you mustn't have been decoupling
she mustn't have been decoupling
we mustn't have been decoupling
you mustn't have been decoupling
they mustn't have been decoupling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I decouple?
must you decouple?
must she decouple?
must we decouple?
must you decouple?
must they decouple? 	must I be decoupling?
must you be decoupling?
must she be decoupling?
must we be decoupling?
must you be decoupling?
must they be decoupling? 	must I have decoupled?
must you have decoupled?
must she have decoupled?
must we have decoupled?
must you have decoupled?
must they have decoupled? 	must I have been decoupling?
must you have been decoupling?
must she have been decoupling?
must we have been decoupling?
must you have been decoupling?
must they have been decoupling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I decouple?
mustn't you decouple?
mustn't she decouple?
mustn't we decouple?
mustn't you decouple?
mustn't they decouple? 	mustn't I be decoupling?
mustn't you be decoupling?
mustn't she be decoupling?
mustn't we be decoupling?
mustn't you be decoupling?
mustn't they be decoupling? 	mustn't I have decoupled?
mustn't you have decoupled?
mustn't she have decoupled?
mustn't we have decoupled?
mustn't you have decoupled?
mustn't they have decoupled? 	mustn't I have been decoupling?
mustn't you have been decoupling?
mustn't she have been decoupling?
mustn't we have been decoupling?
mustn't you have been decoupling?
mustn't they have been decoupling?