must perform
Regular verb: perform - performed- performed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must perform
you must perform
he must perform
we must perform
you must perform
they must perform 	I must be performing
you must be performing
he must be performing
we must be performing
you must be performing
they must be performing	I must have performed
you must have performed
he must have performed
we must have performed
you must have performed
they must have performed	I must have been performing
you must have been performing
he must have been performing
we must have been performing
you must have been performing
they must have been performing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not perform
you must not perform
he must not perform
we must not perform
you must not perform
they must not perform 	I must not be performing
you must not be performing
he must not be performing
we must not be performing
you must not be performing
they must not be performing	I must not have performed
you must not have performed
he must not have performed
we must not have performed
you must not have performed
they must not have performed	I must not have been performing
you must not have been performing
he must not have been performing
we must not have been performing
you must not have been performing
they must not have been performing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I perform?
must you perform?
must he perform?
must we perform?
must you perform?
must they perform? 	must I be performing?
must you be performing?
must he be performing?
must we be performing?
must you be performing?
must they be performing? 	must I have performed?
must you have performed?
must he have performed?
must we have performed?
must you have performed?
must they have performed? 	must I have been performing?
must you have been performing?
must he have been performing?
must we have been performing?
must you have been performing?
must they have been performing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not perform?
must you not perform?
must he not perform?
must we not perform?
must you not perform?
must they not perform? 	must I not be performing?
must you not be performing?
must he not be performing?
must we not be performing?
must you not be performing?
must they not be performing? 	must I not have performed?
must you not have performed?
must he not have performed?
must we not have performed?
must you not have performed?
must they not have performed? 	must I not have been performing?
must you not have been performing?
must he not have been performing?
must we not have been performing?
must you not have been performing?
must they not have been performing?