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