could enrol
Regular verb: enrol - enrolled- enrolled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could enrol
you could enrol
he could enrol
we could enrol
you could enrol
they could enrol 	I could be enrolling
you could be enrolling
he could be enrolling
we could be enrolling
you could be enrolling
they could be enrolling	I could have enrolled
you could have enrolled
he 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
he 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 couldn't enrol
you couldn't enrol
he couldn't enrol
we couldn't enrol
you couldn't enrol
they couldn't enrol 	I couldn't be enrolling
you couldn't be enrolling
he couldn't be enrolling
we couldn't be enrolling
you couldn't be enrolling
they couldn't be enrolling	I couldn't have enrolled
you couldn't have enrolled
he couldn't have enrolled
we couldn't have enrolled
you couldn't have enrolled
they couldn't have enrolled	I couldn't have been enrolling
you couldn't have been enrolling
he couldn't have been enrolling
we couldn't have been enrolling
you couldn't have been enrolling
they couldn't have been enrolling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I enrol?
could you enrol?
could he enrol?
could we enrol?
could you enrol?
could they enrol? 	could I be enrolling?
could you be enrolling?
could he be enrolling?
could we be enrolling?
could you be enrolling?
could they be enrolling? 	could I have enrolled?
could you have enrolled?
could he 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 he 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 	
couldn't I enrol?
couldn't you enrol?
couldn't he enrol?
couldn't we enrol?
couldn't you enrol?
couldn't they enrol? 	couldn't I be enrolling?
couldn't you be enrolling?
couldn't he be enrolling?
couldn't we be enrolling?
couldn't you be enrolling?
couldn't they be enrolling? 	couldn't I have enrolled?
couldn't you have enrolled?
couldn't he have enrolled?
couldn't we have enrolled?
couldn't you have enrolled?
couldn't they have enrolled? 	couldn't I have been enrolling?
couldn't you have been enrolling?
couldn't he have been enrolling?
couldn't we have been enrolling?
couldn't you have been enrolling?
couldn't they have been enrolling?