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