must dehisce
Regular verb: dehisce - dehisced- dehisced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must dehisce
you must dehisce
he must dehisce
we must dehisce
you must dehisce
they must dehisce 	I must be dehiscing
you must be dehiscing
he must be dehiscing
we must be dehiscing
you must be dehiscing
they must be dehiscing	I must have dehisced
you must have dehisced
he must have dehisced
we must have dehisced
you must have dehisced
they must have dehisced	I must have been dehiscing
you must have been dehiscing
he must have been dehiscing
we must have been dehiscing
you must have been dehiscing
they must have been dehiscing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't dehisce
you mustn't dehisce
he mustn't dehisce
we mustn't dehisce
you mustn't dehisce
they mustn't dehisce 	I mustn't be dehiscing
you mustn't be dehiscing
he mustn't be dehiscing
we mustn't be dehiscing
you mustn't be dehiscing
they mustn't be dehiscing	I mustn't have dehisced
you mustn't have dehisced
he mustn't have dehisced
we mustn't have dehisced
you mustn't have dehisced
they mustn't have dehisced	I mustn't have been dehiscing
you mustn't have been dehiscing
he mustn't have been dehiscing
we mustn't have been dehiscing
you mustn't have been dehiscing
they mustn't have been dehiscing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I dehisce?
must you dehisce?
must he dehisce?
must we dehisce?
must you dehisce?
must they dehisce? 	must I be dehiscing?
must you be dehiscing?
must he be dehiscing?
must we be dehiscing?
must you be dehiscing?
must they be dehiscing? 	must I have dehisced?
must you have dehisced?
must he have dehisced?
must we have dehisced?
must you have dehisced?
must they have dehisced? 	must I have been dehiscing?
must you have been dehiscing?
must he have been dehiscing?
must we have been dehiscing?
must you have been dehiscing?
must they have been dehiscing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I dehisce?
mustn't you dehisce?
mustn't he dehisce?
mustn't we dehisce?
mustn't you dehisce?
mustn't they dehisce? 	mustn't I be dehiscing?
mustn't you be dehiscing?
mustn't he be dehiscing?
mustn't we be dehiscing?
mustn't you be dehiscing?
mustn't they be dehiscing? 	mustn't I have dehisced?
mustn't you have dehisced?
mustn't he have dehisced?
mustn't we have dehisced?
mustn't you have dehisced?
mustn't they have dehisced? 	mustn't I have been dehiscing?
mustn't you have been dehiscing?
mustn't he have been dehiscing?
mustn't we have been dehiscing?
mustn't you have been dehiscing?
mustn't they have been dehiscing?