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