must deform
Regular verb: deform - deformed- deformed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must deform
you must deform
she must deform
we must deform
you must deform
they must deform 	I must be deforming
you must be deforming
she must be deforming
we must be deforming
you must be deforming
they must be deforming	I must have deformed
you must have deformed
she must have deformed
we must have deformed
you must have deformed
they must have deformed	I must have been deforming
you must have been deforming
she must have been deforming
we must have been deforming
you must have been deforming
they must have been deforming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't deform
you mustn't deform
she mustn't deform
we mustn't deform
you mustn't deform
they mustn't deform 	I mustn't be deforming
you mustn't be deforming
she mustn't be deforming
we mustn't be deforming
you mustn't be deforming
they mustn't be deforming	I mustn't have deformed
you mustn't have deformed
she mustn't have deformed
we mustn't have deformed
you mustn't have deformed
they mustn't have deformed	I mustn't have been deforming
you mustn't have been deforming
she mustn't have been deforming
we mustn't have been deforming
you mustn't have been deforming
they mustn't have been deforming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I deform?
must you deform?
must she deform?
must we deform?
must you deform?
must they deform? 	must I be deforming?
must you be deforming?
must she be deforming?
must we be deforming?
must you be deforming?
must they be deforming? 	must I have deformed?
must you have deformed?
must she have deformed?
must we have deformed?
must you have deformed?
must they have deformed? 	must I have been deforming?
must you have been deforming?
must she have been deforming?
must we have been deforming?
must you have been deforming?
must they have been deforming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I deform?
mustn't you deform?
mustn't she deform?
mustn't we deform?
mustn't you deform?
mustn't they deform? 	mustn't I be deforming?
mustn't you be deforming?
mustn't she be deforming?
mustn't we be deforming?
mustn't you be deforming?
mustn't they be deforming? 	mustn't I have deformed?
mustn't you have deformed?
mustn't she have deformed?
mustn't we have deformed?
mustn't you have deformed?
mustn't they have deformed? 	mustn't I have been deforming?
mustn't you have been deforming?
mustn't she have been deforming?
mustn't we have been deforming?
mustn't you have been deforming?
mustn't they have been deforming?