I could consult you could consult he could consult we could consult you could consult they could consult
V-ing form
I could be consulting you could be consulting he could be consulting we could be consulting you could be consulting they could be consulting
Perfect
I could have consulted you could have consulted he could have consulted we could have consulted you could have consulted they could have consulted
V-ing perfect
I could have been consulting you could have been consulting he could have been consulting we could have been consulting you could have been consulting they could have been consulting
Negation
Simple form
I could not consult you could not consult he could not consult we could not consult you could not consult they could not consult
V-ing form
I could not be consulting you could not be consulting he could not be consulting we could not be consulting you could not be consulting they could not be consulting
Perfect
I could not have consulted you could not have consulted he could not have consulted we could not have consulted you could not have consulted they could not have consulted
V-ing perfect
I could not have been consulting you could not have been consulting he could not have been consulting we could not have been consulting you could not have been consulting they could not have been consulting
Interrogative form
Simple form
could I consult? could you consult? could he consult? could we consult? could you consult? could they consult?
V-ing form
could I be consulting? could you be consulting? could he be consulting? could we be consulting? could you be consulting? could they be consulting?
Perfect
could I have consulted? could you have consulted? could he have consulted? could we have consulted? could you have consulted? could they have consulted?
V-ing perfect
could I have been consulting? could you have been consulting? could he have been consulting? could we have been consulting? could you have been consulting? could they have been consulting?
Interro-negative form
Simple form
could I not consult? could you not consult? could he not consult? could we not consult? could you not consult? could they not consult?
V-ing form
could I not be consulting? could you not be consulting? could he not be consulting? could we not be consulting? could you not be consulting? could they not be consulting?
Perfect
could I not have consulted? could you not have consulted? could he not have consulted? could we not have consulted? could you not have consulted? could they not have consulted?
V-ing perfect
could I not have been consulting? could you not have been consulting? could he not have been consulting? could we not have been consulting? could you not have been consulting? could they not have been consulting?