must sex
Regular verb: sex - sexed- sexed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sex
you must sex
he must sex
we must sex
you must sex
they must sex 	I must be sexing
you must be sexing
he must be sexing
we must be sexing
you must be sexing
they must be sexing	I must have sexed
you must have sexed
he must have sexed
we must have sexed
you must have sexed
they must have sexed	I must have been sexing
you must have been sexing
he must have been sexing
we must have been sexing
you must have been sexing
they must have been sexing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sex
you mustn't sex
he mustn't sex
we mustn't sex
you mustn't sex
they mustn't sex 	I mustn't be sexing
you mustn't be sexing
he mustn't be sexing
we mustn't be sexing
you mustn't be sexing
they mustn't be sexing	I mustn't have sexed
you mustn't have sexed
he mustn't have sexed
we mustn't have sexed
you mustn't have sexed
they mustn't have sexed	I mustn't have been sexing
you mustn't have been sexing
he mustn't have been sexing
we mustn't have been sexing
you mustn't have been sexing
they mustn't have been sexing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sex?
must you sex?
must he sex?
must we sex?
must you sex?
must they sex? 	must I be sexing?
must you be sexing?
must he be sexing?
must we be sexing?
must you be sexing?
must they be sexing? 	must I have sexed?
must you have sexed?
must he have sexed?
must we have sexed?
must you have sexed?
must they have sexed? 	must I have been sexing?
must you have been sexing?
must he have been sexing?
must we have been sexing?
must you have been sexing?
must they have been sexing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sex?
mustn't you sex?
mustn't he sex?
mustn't we sex?
mustn't you sex?
mustn't they sex? 	mustn't I be sexing?
mustn't you be sexing?
mustn't he be sexing?
mustn't we be sexing?
mustn't you be sexing?
mustn't they be sexing? 	mustn't I have sexed?
mustn't you have sexed?
mustn't he have sexed?
mustn't we have sexed?
mustn't you have sexed?
mustn't they have sexed? 	mustn't I have been sexing?
mustn't you have been sexing?
mustn't he have been sexing?
mustn't we have been sexing?
mustn't you have been sexing?
mustn't they have been sexing?