Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could ego you could ego she could ego we could ego you could ego they could ego
V-ing form
I could be egoing you could be egoing she could be egoing we could be egoing you could be egoing they could be egoing
Perfect
I could have egoed you could have egoed she could have egoed we could have egoed you could have egoed they could have egoed
V-ing perfect
I could have been egoing you could have been egoing she could have been egoing we could have been egoing you could have been egoing they could have been egoing
Negation
Simple form
I couldn't ego you couldn't ego she couldn't ego we couldn't ego you couldn't ego they couldn't ego
V-ing form
I couldn't be egoing you couldn't be egoing she couldn't be egoing we couldn't be egoing you couldn't be egoing they couldn't be egoing
Perfect
I couldn't have egoed you couldn't have egoed she couldn't have egoed we couldn't have egoed you couldn't have egoed they couldn't have egoed
V-ing perfect
I couldn't have been egoing you couldn't have been egoing she couldn't have been egoing we couldn't have been egoing you couldn't have been egoing they couldn't have been egoing
Interrogative form
Simple form
could I ego? could you ego? could she ego? could we ego? could you ego? could they ego?
V-ing form
could I be egoing? could you be egoing? could she be egoing? could we be egoing? could you be egoing? could they be egoing?
Perfect
could I have egoed? could you have egoed? could she have egoed? could we have egoed? could you have egoed? could they have egoed?
V-ing perfect
could I have been egoing? could you have been egoing? could she have been egoing? could we have been egoing? could you have been egoing? could they have been egoing?
Interro-negative form
Simple form
couldn't I ego? couldn't you ego? couldn't she ego? couldn't we ego? couldn't you ego? couldn't they ego?
V-ing form
couldn't I be egoing? couldn't you be egoing? couldn't she be egoing? couldn't we be egoing? couldn't you be egoing? couldn't they be egoing?
Perfect
couldn't I have egoed? couldn't you have egoed? couldn't she have egoed? couldn't we have egoed? couldn't you have egoed? couldn't they have egoed?
V-ing perfect
couldn't I have been egoing? couldn't you have been egoing? couldn't she have been egoing? couldn't we have been egoing? couldn't you have been egoing? couldn't they have been egoing?