must pun
Regular verb: pun - punned- punned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pun
you must pun
he must pun
we must pun
you must pun
they must pun 	I must be punning
you must be punning
he must be punning
we must be punning
you must be punning
they must be punning	I must have punned
you must have punned
he must have punned
we must have punned
you must have punned
they must have punned	I must have been punning
you must have been punning
he must have been punning
we must have been punning
you must have been punning
they must have been punning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't pun
you mustn't pun
he mustn't pun
we mustn't pun
you mustn't pun
they mustn't pun 	I mustn't be punning
you mustn't be punning
he mustn't be punning
we mustn't be punning
you mustn't be punning
they mustn't be punning	I mustn't have punned
you mustn't have punned
he mustn't have punned
we mustn't have punned
you mustn't have punned
they mustn't have punned	I mustn't have been punning
you mustn't have been punning
he mustn't have been punning
we mustn't have been punning
you mustn't have been punning
they mustn't have been punning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pun?
must you pun?
must he pun?
must we pun?
must you pun?
must they pun? 	must I be punning?
must you be punning?
must he be punning?
must we be punning?
must you be punning?
must they be punning? 	must I have punned?
must you have punned?
must he have punned?
must we have punned?
must you have punned?
must they have punned? 	must I have been punning?
must you have been punning?
must he have been punning?
must we have been punning?
must you have been punning?
must they have been punning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I pun?
mustn't you pun?
mustn't he pun?
mustn't we pun?
mustn't you pun?
mustn't they pun? 	mustn't I be punning?
mustn't you be punning?
mustn't he be punning?
mustn't we be punning?
mustn't you be punning?
mustn't they be punning? 	mustn't I have punned?
mustn't you have punned?
mustn't he have punned?
mustn't we have punned?
mustn't you have punned?
mustn't they have punned? 	mustn't I have been punning?
mustn't you have been punning?
mustn't he have been punning?
mustn't we have been punning?
mustn't you have been punning?
mustn't they have been punning?