I could educate you could educate she could educate we could educate you could educate they could educate
V-ing form
I could be educating you could be educating she could be educating we could be educating you could be educating they could be educating
Perfect
I could have educated you could have educated she could have educated we could have educated you could have educated they could have educated
V-ing perfect
I could have been educating you could have been educating she could have been educating we could have been educating you could have been educating they could have been educating
Negation
Simple form
I could not educate you could not educate she could not educate we could not educate you could not educate they could not educate
V-ing form
I could not be educating you could not be educating she could not be educating we could not be educating you could not be educating they could not be educating
Perfect
I could not have educated you could not have educated she could not have educated we could not have educated you could not have educated they could not have educated
V-ing perfect
I could not have been educating you could not have been educating she could not have been educating we could not have been educating you could not have been educating they could not have been educating
Interrogative form
Simple form
could I educate? could you educate? could she educate? could we educate? could you educate? could they educate?
V-ing form
could I be educating? could you be educating? could she be educating? could we be educating? could you be educating? could they be educating?
Perfect
could I have educated? could you have educated? could she have educated? could we have educated? could you have educated? could they have educated?
V-ing perfect
could I have been educating? could you have been educating? could she have been educating? could we have been educating? could you have been educating? could they have been educating?
Interro-negative form
Simple form
could I not educate? could you not educate? could she not educate? could we not educate? could you not educate? could they not educate?
V-ing form
could I not be educating? could you not be educating? could she not be educating? could we not be educating? could you not be educating? could they not be educating?
Perfect
could I not have educated? could you not have educated? could she not have educated? could we not have educated? could you not have educated? could they not have educated?
V-ing perfect
could I not have been educating? could you not have been educating? could she not have been educating? could we not have been educating? could you not have been educating? could they not have been educating?