English verb conjugation
COULD ENROLL

Regular verb: enroll - enrolled - enrolled

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't enroll you couldn't enroll she couldn't enroll we couldn't enroll you couldn't enroll they couldn't enroll	I couldn't be enrolling you couldn't be enrolling she couldn't be enrolling we couldn't be enrolling you couldn't be enrolling they couldn't be enrolling
Perfect	V-ing perfect
I couldn't have enrolled you couldn't have enrolled she 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 she 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
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?
Perfect	V-ing perfect
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
couldn't I enroll? couldn't you enroll? couldn't she enroll? couldn't we enroll? couldn't you enroll? couldn't they enroll?	couldn't I be enrolling? couldn't you be enrolling? couldn't she be enrolling? couldn't we be enrolling? couldn't you be enrolling? couldn't they be enrolling?
Perfect	V-ing perfect
couldn't I have enrolled? couldn't you have enrolled? couldn't she 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 she have been enrolling? couldn't we have been enrolling? couldn't you have been enrolling? couldn't they have been enrolling?