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 can't consult you can't consult he can't consult we can't consult you can't consult they can't consult
V-ing form
I can't be consulting you can't be consulting he can't be consulting we can't be consulting you can't be consulting they can't be consulting
Perfect
I can't have consulted you can't have consulted he can't have consulted we can't have consulted you can't have consulted they can't have consulted
V-ing perfect
I can't have been consulting you can't have been consulting he can't have been consulting we can't have been consulting you can't have been consulting they can't 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't I consult? can't you consult? can't he consult? can't we consult? can't you consult? can't they consult?
V-ing form
can't I be consulting? can't you be consulting? can't he be consulting? can't we be consulting? can't you be consulting? can't they be consulting?
Perfect
can't I have consulted? can't you have consulted? can't he have consulted? can't we have consulted? can't you have consulted? can't they have consulted?
V-ing perfect
can't I have been consulting? can't you have been consulting? can't he have been consulting? can't we have been consulting? can't you have been consulting? can't they have been consulting?