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