I must disabuse you must disabuse he must disabuse we must disabuse you must disabuse they must disabuse
V-ing form
I must be disabusing you must be disabusing he must be disabusing we must be disabusing you must be disabusing they must be disabusing
Perfect
I must have disabused you must have disabused he must have disabused we must have disabused you must have disabused they must have disabused
V-ing perfect
I must have been disabusing you must have been disabusing he must have been disabusing we must have been disabusing you must have been disabusing they must have been disabusing
Negation
Simple form
I mustn't disabuse you mustn't disabuse he mustn't disabuse we mustn't disabuse you mustn't disabuse they mustn't disabuse
V-ing form
I mustn't be disabusing you mustn't be disabusing he mustn't be disabusing we mustn't be disabusing you mustn't be disabusing they mustn't be disabusing
Perfect
I mustn't have disabused you mustn't have disabused he mustn't have disabused we mustn't have disabused you mustn't have disabused they mustn't have disabused
V-ing perfect
I mustn't have been disabusing you mustn't have been disabusing he mustn't have been disabusing we mustn't have been disabusing you mustn't have been disabusing they mustn't have been disabusing
Interrogative form
Simple form
must I disabuse? must you disabuse? must he disabuse? must we disabuse? must you disabuse? must they disabuse?
V-ing form
must I be disabusing? must you be disabusing? must he be disabusing? must we be disabusing? must you be disabusing? must they be disabusing?
Perfect
must I have disabused? must you have disabused? must he have disabused? must we have disabused? must you have disabused? must they have disabused?
V-ing perfect
must I have been disabusing? must you have been disabusing? must he have been disabusing? must we have been disabusing? must you have been disabusing? must they have been disabusing?
Interro-negative form
Simple form
mustn't I disabuse? mustn't you disabuse? mustn't he disabuse? mustn't we disabuse? mustn't you disabuse? mustn't they disabuse?
V-ing form
mustn't I be disabusing? mustn't you be disabusing? mustn't he be disabusing? mustn't we be disabusing? mustn't you be disabusing? mustn't they be disabusing?
Perfect
mustn't I have disabused? mustn't you have disabused? mustn't he have disabused? mustn't we have disabused? mustn't you have disabused? mustn't they have disabused?
V-ing perfect
mustn't I have been disabusing? mustn't you have been disabusing? mustn't he have been disabusing? mustn't we have been disabusing? mustn't you have been disabusing? mustn't they have been disabusing?