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