must decarburise
Regular verb: decarburise - decarburised- decarburised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must decarburise
you must decarburise
he must decarburise
we must decarburise
you must decarburise
they must decarburise 	I must be decarburising
you must be decarburising
he must be decarburising
we must be decarburising
you must be decarburising
they must be decarburising	I must have decarburised
you must have decarburised
he must have decarburised
we must have decarburised
you must have decarburised
they must have decarburised	I must have been decarburising
you must have been decarburising
he must have been decarburising
we must have been decarburising
you must have been decarburising
they must have been decarburising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't decarburise
you mustn't decarburise
he mustn't decarburise
we mustn't decarburise
you mustn't decarburise
they mustn't decarburise 	I mustn't be decarburising
you mustn't be decarburising
he mustn't be decarburising
we mustn't be decarburising
you mustn't be decarburising
they mustn't be decarburising	I mustn't have decarburised
you mustn't have decarburised
he mustn't have decarburised
we mustn't have decarburised
you mustn't have decarburised
they mustn't have decarburised	I mustn't have been decarburising
you mustn't have been decarburising
he mustn't have been decarburising
we mustn't have been decarburising
you mustn't have been decarburising
they mustn't have been decarburising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I decarburise?
must you decarburise?
must he decarburise?
must we decarburise?
must you decarburise?
must they decarburise? 	must I be decarburising?
must you be decarburising?
must he be decarburising?
must we be decarburising?
must you be decarburising?
must they be decarburising? 	must I have decarburised?
must you have decarburised?
must he have decarburised?
must we have decarburised?
must you have decarburised?
must they have decarburised? 	must I have been decarburising?
must you have been decarburising?
must he have been decarburising?
must we have been decarburising?
must you have been decarburising?
must they have been decarburising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I decarburise?
mustn't you decarburise?
mustn't he decarburise?
mustn't we decarburise?
mustn't you decarburise?
mustn't they decarburise? 	mustn't I be decarburising?
mustn't you be decarburising?
mustn't he be decarburising?
mustn't we be decarburising?
mustn't you be decarburising?
mustn't they be decarburising? 	mustn't I have decarburised?
mustn't you have decarburised?
mustn't he have decarburised?
mustn't we have decarburised?
mustn't you have decarburised?
mustn't they have decarburised? 	mustn't I have been decarburising?
mustn't you have been decarburising?
mustn't he have been decarburising?
mustn't we have been decarburising?
mustn't you have been decarburising?
mustn't they have been decarburising?