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 could not rave you could not rave he could not rave we could not rave you could not rave they could not rave
V-ing form
I could not be raving you could not be raving he could not be raving we could not be raving you could not be raving they could not be raving
Perfect
I could not have raved you could not have raved he could not have raved we could not have raved you could not have raved they could not have raved
V-ing perfect
I could not have been raving you could not have been raving he could not have been raving we could not have been raving you could not have been raving they could not 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
could I not rave? could you not rave? could he not rave? could we not rave? could you not rave? could they not rave?
V-ing form
could I not be raving? could you not be raving? could he not be raving? could we not be raving? could you not be raving? could they not be raving?
Perfect
could I not have raved? could you not have raved? could he not have raved? could we not have raved? could you not have raved? could they not have raved?
V-ing perfect
could I not have been raving? could you not have been raving? could he not have been raving? could we not have been raving? could you not have been raving? could they not have been raving?