must disagree
Regular verb: disagree - disagreed- disagreed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must disagree
you must disagree
he must disagree
we must disagree
you must disagree
they must disagree 	I must be disagreeing
you must be disagreeing
he must be disagreeing
we must be disagreeing
you must be disagreeing
they must be disagreeing	I must have disagreed
you must have disagreed
he must have disagreed
we must have disagreed
you must have disagreed
they must have disagreed	I must have been disagreeing
you must have been disagreeing
he must have been disagreeing
we must have been disagreeing
you must have been disagreeing
they must have been disagreeing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't disagree
you mustn't disagree
he mustn't disagree
we mustn't disagree
you mustn't disagree
they mustn't disagree 	I mustn't be disagreeing
you mustn't be disagreeing
he mustn't be disagreeing
we mustn't be disagreeing
you mustn't be disagreeing
they mustn't be disagreeing	I mustn't have disagreed
you mustn't have disagreed
he mustn't have disagreed
we mustn't have disagreed
you mustn't have disagreed
they mustn't have disagreed	I mustn't have been disagreeing
you mustn't have been disagreeing
he mustn't have been disagreeing
we mustn't have been disagreeing
you mustn't have been disagreeing
they mustn't have been disagreeing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I disagree?
must you disagree?
must he disagree?
must we disagree?
must you disagree?
must they disagree? 	must I be disagreeing?
must you be disagreeing?
must he be disagreeing?
must we be disagreeing?
must you be disagreeing?
must they be disagreeing? 	must I have disagreed?
must you have disagreed?
must he have disagreed?
must we have disagreed?
must you have disagreed?
must they have disagreed? 	must I have been disagreeing?
must you have been disagreeing?
must he have been disagreeing?
must we have been disagreeing?
must you have been disagreeing?
must they have been disagreeing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I disagree?
mustn't you disagree?
mustn't he disagree?
mustn't we disagree?
mustn't you disagree?
mustn't they disagree? 	mustn't I be disagreeing?
mustn't you be disagreeing?
mustn't he be disagreeing?
mustn't we be disagreeing?
mustn't you be disagreeing?
mustn't they be disagreeing? 	mustn't I have disagreed?
mustn't you have disagreed?
mustn't he have disagreed?
mustn't we have disagreed?
mustn't you have disagreed?
mustn't they have disagreed? 	mustn't I have been disagreeing?
mustn't you have been disagreeing?
mustn't he have been disagreeing?
mustn't we have been disagreeing?
mustn't you have been disagreeing?
mustn't they have been disagreeing?