must tun
Regular verb: tun - tuned- tuned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tun
you must tun
he must tun
we must tun
you must tun
they must tun 	I must be tuning
you must be tuning
he must be tuning
we must be tuning
you must be tuning
they must be tuning	I must have tuned
you must have tuned
he must have tuned
we must have tuned
you must have tuned
they must have tuned	I must have been tuning
you must have been tuning
he must have been tuning
we must have been tuning
you must have been tuning
they must have been tuning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't tun
you mustn't tun
he mustn't tun
we mustn't tun
you mustn't tun
they mustn't tun 	I mustn't be tuning
you mustn't be tuning
he mustn't be tuning
we mustn't be tuning
you mustn't be tuning
they mustn't be tuning	I mustn't have tuned
you mustn't have tuned
he mustn't have tuned
we mustn't have tuned
you mustn't have tuned
they mustn't have tuned	I mustn't have been tuning
you mustn't have been tuning
he mustn't have been tuning
we mustn't have been tuning
you mustn't have been tuning
they mustn't have been tuning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tun?
must you tun?
must he tun?
must we tun?
must you tun?
must they tun? 	must I be tuning?
must you be tuning?
must he be tuning?
must we be tuning?
must you be tuning?
must they be tuning? 	must I have tuned?
must you have tuned?
must he have tuned?
must we have tuned?
must you have tuned?
must they have tuned? 	must I have been tuning?
must you have been tuning?
must he have been tuning?
must we have been tuning?
must you have been tuning?
must they have been tuning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I tun?
mustn't you tun?
mustn't he tun?
mustn't we tun?
mustn't you tun?
mustn't they tun? 	mustn't I be tuning?
mustn't you be tuning?
mustn't he be tuning?
mustn't we be tuning?
mustn't you be tuning?
mustn't they be tuning? 	mustn't I have tuned?
mustn't you have tuned?
mustn't he have tuned?
mustn't we have tuned?
mustn't you have tuned?
mustn't they have tuned? 	mustn't I have been tuning?
mustn't you have been tuning?
mustn't he have been tuning?
mustn't we have been tuning?
mustn't you have been tuning?
mustn't they have been tuning?