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