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