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