must disannul
Regular verb: disannul - disannuled- disannuled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must disannul
you must disannul
he must disannul
we must disannul
you must disannul
they must disannul 	I must be disannuling
you must be disannuling
he must be disannuling
we must be disannuling
you must be disannuling
they must be disannuling	I must have disannuled
you must have disannuled
he must have disannuled
we must have disannuled
you must have disannuled
they must have disannuled	I must have been disannuling
you must have been disannuling
he must have been disannuling
we must have been disannuling
you must have been disannuling
they must have been disannuling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't disannul
you mustn't disannul
he mustn't disannul
we mustn't disannul
you mustn't disannul
they mustn't disannul 	I mustn't be disannuling
you mustn't be disannuling
he mustn't be disannuling
we mustn't be disannuling
you mustn't be disannuling
they mustn't be disannuling	I mustn't have disannuled
you mustn't have disannuled
he mustn't have disannuled
we mustn't have disannuled
you mustn't have disannuled
they mustn't have disannuled	I mustn't have been disannuling
you mustn't have been disannuling
he mustn't have been disannuling
we mustn't have been disannuling
you mustn't have been disannuling
they mustn't have been disannuling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I disannul?
must you disannul?
must he disannul?
must we disannul?
must you disannul?
must they disannul? 	must I be disannuling?
must you be disannuling?
must he be disannuling?
must we be disannuling?
must you be disannuling?
must they be disannuling? 	must I have disannuled?
must you have disannuled?
must he have disannuled?
must we have disannuled?
must you have disannuled?
must they have disannuled? 	must I have been disannuling?
must you have been disannuling?
must he have been disannuling?
must we have been disannuling?
must you have been disannuling?
must they have been disannuling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I disannul?
mustn't you disannul?
mustn't he disannul?
mustn't we disannul?
mustn't you disannul?
mustn't they disannul? 	mustn't I be disannuling?
mustn't you be disannuling?
mustn't he be disannuling?
mustn't we be disannuling?
mustn't you be disannuling?
mustn't they be disannuling? 	mustn't I have disannuled?
mustn't you have disannuled?
mustn't he have disannuled?
mustn't we have disannuled?
mustn't you have disannuled?
mustn't they have disannuled? 	mustn't I have been disannuling?
mustn't you have been disannuling?
mustn't he have been disannuling?
mustn't we have been disannuling?
mustn't you have been disannuling?
mustn't they have been disannuling?