must pun
Regular verb: pun - punned- punned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pun
you must pun
she must pun
we must pun
you must pun
they must pun 	I must be punning
you must be punning
she must be punning
we must be punning
you must be punning
they must be punning	I must have punned
you must have punned
she 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
she 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 must not pun
you must not pun
she must not pun
we must not pun
you must not pun
they must not pun 	I must not be punning
you must not be punning
she must not be punning
we must not be punning
you must not be punning
they must not be punning	I must not have punned
you must not have punned
she must not have punned
we must not have punned
you must not have punned
they must not have punned	I must not have been punning
you must not have been punning
she must not have been punning
we must not have been punning
you must not have been punning
they must not have been punning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pun?
must you pun?
must she pun?
must we pun?
must you pun?
must they pun? 	must I be punning?
must you be punning?
must she be punning?
must we be punning?
must you be punning?
must they be punning? 	must I have punned?
must you have punned?
must she 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 she 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 	
must I not pun?
must you not pun?
must she not pun?
must we not pun?
must you not pun?
must they not pun? 	must I not be punning?
must you not be punning?
must she not be punning?
must we not be punning?
must you not be punning?
must they not be punning? 	must I not have punned?
must you not have punned?
must she not have punned?
must we not have punned?
must you not have punned?
must they not have punned? 	must I not have been punning?
must you not have been punning?
must she not have been punning?
must we not have been punning?
must you not have been punning?
must they not have been punning?