I could housebreak you could housebreak he could housebreak we could housebreak you could housebreak they could housebreak
V-ing form
I could be housebreaking you could be housebreaking he could be housebreaking we could be housebreaking you could be housebreaking they could be housebreaking
Perfect
I could have housebroken you could have housebroken he could have housebroken we could have housebroken you could have housebroken they could have housebroken
V-ing perfect
I could have been housebreaking you could have been housebreaking he could have been housebreaking we could have been housebreaking you could have been housebreaking they could have been housebreaking
Negation
Simple form
I could not housebreak you could not housebreak he could not housebreak we could not housebreak you could not housebreak they could not housebreak
V-ing form
I could not be housebreaking you could not be housebreaking he could not be housebreaking we could not be housebreaking you could not be housebreaking they could not be housebreaking
Perfect
I could not have housebroken you could not have housebroken he could not have housebroken we could not have housebroken you could not have housebroken they could not have housebroken
V-ing perfect
I could not have been housebreaking you could not have been housebreaking he could not have been housebreaking we could not have been housebreaking you could not have been housebreaking they could not have been housebreaking
Interrogative form
Simple form
could I housebreak? could you housebreak? could he housebreak? could we housebreak? could you housebreak? could they housebreak?
V-ing form
could I be housebreaking? could you be housebreaking? could he be housebreaking? could we be housebreaking? could you be housebreaking? could they be housebreaking?
Perfect
could I have housebroken? could you have housebroken? could he have housebroken? could we have housebroken? could you have housebroken? could they have housebroken?
V-ing perfect
could I have been housebreaking? could you have been housebreaking? could he have been housebreaking? could we have been housebreaking? could you have been housebreaking? could they have been housebreaking?
Interro-negative form
Simple form
could I not housebreak? could you not housebreak? could he not housebreak? could we not housebreak? could you not housebreak? could they not housebreak?
V-ing form
could I not be housebreaking? could you not be housebreaking? could he not be housebreaking? could we not be housebreaking? could you not be housebreaking? could they not be housebreaking?
Perfect
could I not have housebroken? could you not have housebroken? could he not have housebroken? could we not have housebroken? could you not have housebroken? could they not have housebroken?
V-ing perfect
could I not have been housebreaking? could you not have been housebreaking? could he not have been housebreaking? could we not have been housebreaking? could you not have been housebreaking? could they not have been housebreaking?