I could devour you could devour he could devour we could devour you could devour they could devour
V-ing form
I could be devouring you could be devouring he could be devouring we could be devouring you could be devouring they could be devouring
Perfect
I could have devoured you could have devoured he could have devoured we could have devoured you could have devoured they could have devoured
V-ing perfect
I could have been devouring you could have been devouring he could have been devouring we could have been devouring you could have been devouring they could have been devouring
Negation
Simple form
I couldn't devour you couldn't devour he couldn't devour we couldn't devour you couldn't devour they couldn't devour
V-ing form
I couldn't be devouring you couldn't be devouring he couldn't be devouring we couldn't be devouring you couldn't be devouring they couldn't be devouring
Perfect
I couldn't have devoured you couldn't have devoured he couldn't have devoured we couldn't have devoured you couldn't have devoured they couldn't have devoured
V-ing perfect
I couldn't have been devouring you couldn't have been devouring he couldn't have been devouring we couldn't have been devouring you couldn't have been devouring they couldn't have been devouring
Interrogative form
Simple form
could I devour? could you devour? could he devour? could we devour? could you devour? could they devour?
V-ing form
could I be devouring? could you be devouring? could he be devouring? could we be devouring? could you be devouring? could they be devouring?
Perfect
could I have devoured? could you have devoured? could he have devoured? could we have devoured? could you have devoured? could they have devoured?
V-ing perfect
could I have been devouring? could you have been devouring? could he have been devouring? could we have been devouring? could you have been devouring? could they have been devouring?
Interro-negative form
Simple form
couldn't I devour? couldn't you devour? couldn't he devour? couldn't we devour? couldn't you devour? couldn't they devour?
V-ing form
couldn't I be devouring? couldn't you be devouring? couldn't he be devouring? couldn't we be devouring? couldn't you be devouring? couldn't they be devouring?
Perfect
couldn't I have devoured? couldn't you have devoured? couldn't he have devoured? couldn't we have devoured? couldn't you have devoured? couldn't they have devoured?
V-ing perfect
couldn't I have been devouring? couldn't you have been devouring? couldn't he have been devouring? couldn't we have been devouring? couldn't you have been devouring? couldn't they have been devouring?