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