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 couldn't educate you couldn't educate she couldn't educate we couldn't educate you couldn't educate they couldn't educate
V-ing form
I couldn't be educating you couldn't be educating she couldn't be educating we couldn't be educating you couldn't be educating they couldn't be educating
Perfect
I couldn't have educated you couldn't have educated she couldn't have educated we couldn't have educated you couldn't have educated they couldn't have educated
V-ing perfect
I couldn't have been educating you couldn't have been educating she couldn't have been educating we couldn't have been educating you couldn't have been educating they couldn't 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
couldn't I educate? couldn't you educate? couldn't she educate? couldn't we educate? couldn't you educate? couldn't they educate?
V-ing form
couldn't I be educating? couldn't you be educating? couldn't she be educating? couldn't we be educating? couldn't you be educating? couldn't they be educating?
Perfect
couldn't I have educated? couldn't you have educated? couldn't she have educated? couldn't we have educated? couldn't you have educated? couldn't they have educated?
V-ing perfect
couldn't I have been educating? couldn't you have been educating? couldn't she have been educating? couldn't we have been educating? couldn't you have been educating? couldn't they have been educating?