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