must deter
Regular verb: deter - detered- detered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must deter
you must deter
she must deter
we must deter
you must deter
they must deter 	I must be detering
you must be detering
she must be detering
we must be detering
you must be detering
they must be detering	I must have detered
you must have detered
she must have detered
we must have detered
you must have detered
they must have detered	I must have been detering
you must have been detering
she must have been detering
we must have been detering
you must have been detering
they must have been detering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't deter
you mustn't deter
she mustn't deter
we mustn't deter
you mustn't deter
they mustn't deter 	I mustn't be detering
you mustn't be detering
she mustn't be detering
we mustn't be detering
you mustn't be detering
they mustn't be detering	I mustn't have detered
you mustn't have detered
she mustn't have detered
we mustn't have detered
you mustn't have detered
they mustn't have detered	I mustn't have been detering
you mustn't have been detering
she mustn't have been detering
we mustn't have been detering
you mustn't have been detering
they mustn't have been detering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I deter?
must you deter?
must she deter?
must we deter?
must you deter?
must they deter? 	must I be detering?
must you be detering?
must she be detering?
must we be detering?
must you be detering?
must they be detering? 	must I have detered?
must you have detered?
must she have detered?
must we have detered?
must you have detered?
must they have detered? 	must I have been detering?
must you have been detering?
must she have been detering?
must we have been detering?
must you have been detering?
must they have been detering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I deter?
mustn't you deter?
mustn't she deter?
mustn't we deter?
mustn't you deter?
mustn't they deter? 	mustn't I be detering?
mustn't you be detering?
mustn't she be detering?
mustn't we be detering?
mustn't you be detering?
mustn't they be detering? 	mustn't I have detered?
mustn't you have detered?
mustn't she have detered?
mustn't we have detered?
mustn't you have detered?
mustn't they have detered? 	mustn't I have been detering?
mustn't you have been detering?
mustn't she have been detering?
mustn't we have been detering?
mustn't you have been detering?
mustn't they have been detering?