must enroll
Regular verb: enroll - enrolled- enrolled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must enroll
you must enroll
he must enroll
we must enroll
you must enroll
they must enroll 	I must be enrolling
you must be enrolling
he must be enrolling
we must be enrolling
you must be enrolling
they must be enrolling	I must have enrolled
you must have enrolled
he must have enrolled
we must have enrolled
you must have enrolled
they must have enrolled	I must have been enrolling
you must have been enrolling
he must have been enrolling
we must have been enrolling
you must have been enrolling
they must have been enrolling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not enroll
you must not enroll
he must not enroll
we must not enroll
you must not enroll
they must not enroll 	I must not be enrolling
you must not be enrolling
he must not be enrolling
we must not be enrolling
you must not be enrolling
they must not be enrolling	I must not have enrolled
you must not have enrolled
he must not have enrolled
we must not have enrolled
you must not have enrolled
they must not have enrolled	I must not have been enrolling
you must not have been enrolling
he must not have been enrolling
we must not have been enrolling
you must not have been enrolling
they must not have been enrolling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I enroll?
must you enroll?
must he enroll?
must we enroll?
must you enroll?
must they enroll? 	must I be enrolling?
must you be enrolling?
must he be enrolling?
must we be enrolling?
must you be enrolling?
must they be enrolling? 	must I have enrolled?
must you have enrolled?
must he have enrolled?
must we have enrolled?
must you have enrolled?
must they have enrolled? 	must I have been enrolling?
must you have been enrolling?
must he have been enrolling?
must we have been enrolling?
must you have been enrolling?
must they have been enrolling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not enroll?
must you not enroll?
must he not enroll?
must we not enroll?
must you not enroll?
must they not enroll? 	must I not be enrolling?
must you not be enrolling?
must he not be enrolling?
must we not be enrolling?
must you not be enrolling?
must they not be enrolling? 	must I not have enrolled?
must you not have enrolled?
must he not have enrolled?
must we not have enrolled?
must you not have enrolled?
must they not have enrolled? 	must I not have been enrolling?
must you not have been enrolling?
must he not have been enrolling?
must we not have been enrolling?
must you not have been enrolling?
must they not have been enrolling?