could enroll
Regular verb: enroll - enrolled- enrolled

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

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

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

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