Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could prepare prepare you could prepare prepare she could prepare prepare we could prepare prepare you could prepare prepare they could prepare prepare
V-ing form
I could be prepare preparing you could be prepare preparing she could be prepare preparing we could be prepare preparing you could be prepare preparing they could be prepare preparing
Perfect
I could have prepare prepared you could have prepare prepared she could have prepare prepared we could have prepare prepared you could have prepare prepared they could have prepare prepared
V-ing perfect
I could have been prepare preparing you could have been prepare preparing she could have been prepare preparing we could have been prepare preparing you could have been prepare preparing they could have been prepare preparing
Negation
Simple form
I could not prepare prepare you could not prepare prepare she could not prepare prepare we could not prepare prepare you could not prepare prepare they could not prepare prepare
V-ing form
I could not be prepare preparing you could not be prepare preparing she could not be prepare preparing we could not be prepare preparing you could not be prepare preparing they could not be prepare preparing
Perfect
I could not have prepare prepared you could not have prepare prepared she could not have prepare prepared we could not have prepare prepared you could not have prepare prepared they could not have prepare prepared
V-ing perfect
I could not have been prepare preparing you could not have been prepare preparing she could not have been prepare preparing we could not have been prepare preparing you could not have been prepare preparing they could not have been prepare preparing
Interrogative form
Simple form
could I prepare prepare? could you prepare prepare? could she prepare prepare? could we prepare prepare? could you prepare prepare? could they prepare prepare?
V-ing form
could I be prepare preparing? could you be prepare preparing? could she be prepare preparing? could we be prepare preparing? could you be prepare preparing? could they be prepare preparing?
Perfect
could I have prepare prepared? could you have prepare prepared? could she have prepare prepared? could we have prepare prepared? could you have prepare prepared? could they have prepare prepared?
V-ing perfect
could I have been prepare preparing? could you have been prepare preparing? could she have been prepare preparing? could we have been prepare preparing? could you have been prepare preparing? could they have been prepare preparing?
Interro-negative form
Simple form
could I not prepare prepare? could you not prepare prepare? could she not prepare prepare? could we not prepare prepare? could you not prepare prepare? could they not prepare prepare?
V-ing form
could I not be prepare preparing? could you not be prepare preparing? could she not be prepare preparing? could we not be prepare preparing? could you not be prepare preparing? could they not be prepare preparing?
Perfect
could I not have prepare prepared? could you not have prepare prepared? could she not have prepare prepared? could we not have prepare prepared? could you not have prepare prepared? could they not have prepare prepared?
V-ing perfect
could I not have been prepare preparing? could you not have been prepare preparing? could she not have been prepare preparing? could we not have been prepare preparing? could you not have been prepare preparing? could they not have been prepare preparing?