must decriminalise
Regular verb: decriminalise - decriminalised- decriminalised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must decriminalise
you must decriminalise
he must decriminalise
we must decriminalise
you must decriminalise
they must decriminalise 	I must be decriminalising
you must be decriminalising
he must be decriminalising
we must be decriminalising
you must be decriminalising
they must be decriminalising	I must have decriminalised
you must have decriminalised
he must have decriminalised
we must have decriminalised
you must have decriminalised
they must have decriminalised	I must have been decriminalising
you must have been decriminalising
he must have been decriminalising
we must have been decriminalising
you must have been decriminalising
they must have been decriminalising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't decriminalise
you mustn't decriminalise
he mustn't decriminalise
we mustn't decriminalise
you mustn't decriminalise
they mustn't decriminalise 	I mustn't be decriminalising
you mustn't be decriminalising
he mustn't be decriminalising
we mustn't be decriminalising
you mustn't be decriminalising
they mustn't be decriminalising	I mustn't have decriminalised
you mustn't have decriminalised
he mustn't have decriminalised
we mustn't have decriminalised
you mustn't have decriminalised
they mustn't have decriminalised	I mustn't have been decriminalising
you mustn't have been decriminalising
he mustn't have been decriminalising
we mustn't have been decriminalising
you mustn't have been decriminalising
they mustn't have been decriminalising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I decriminalise?
must you decriminalise?
must he decriminalise?
must we decriminalise?
must you decriminalise?
must they decriminalise? 	must I be decriminalising?
must you be decriminalising?
must he be decriminalising?
must we be decriminalising?
must you be decriminalising?
must they be decriminalising? 	must I have decriminalised?
must you have decriminalised?
must he have decriminalised?
must we have decriminalised?
must you have decriminalised?
must they have decriminalised? 	must I have been decriminalising?
must you have been decriminalising?
must he have been decriminalising?
must we have been decriminalising?
must you have been decriminalising?
must they have been decriminalising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I decriminalise?
mustn't you decriminalise?
mustn't he decriminalise?
mustn't we decriminalise?
mustn't you decriminalise?
mustn't they decriminalise? 	mustn't I be decriminalising?
mustn't you be decriminalising?
mustn't he be decriminalising?
mustn't we be decriminalising?
mustn't you be decriminalising?
mustn't they be decriminalising? 	mustn't I have decriminalised?
mustn't you have decriminalised?
mustn't he have decriminalised?
mustn't we have decriminalised?
mustn't you have decriminalised?
mustn't they have decriminalised? 	mustn't I have been decriminalising?
mustn't you have been decriminalising?
mustn't he have been decriminalising?
mustn't we have been decriminalising?
mustn't you have been decriminalising?
mustn't they have been decriminalising?