I could consult you could consult she could consult we could consult you could consult they could consult
V-ing form
I could be consulting you could be consulting she could be consulting we could be consulting you could be consulting they could be consulting
Perfect
I could have consulted you could have consulted she 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 she could have been consulting we could have been consulting you could have been consulting they could have been consulting
Negation
Simple form
I couldn't consult you couldn't consult she couldn't consult we couldn't consult you couldn't consult they couldn't consult
V-ing form
I couldn't be consulting you couldn't be consulting she couldn't be consulting we couldn't be consulting you couldn't be consulting they couldn't be consulting
Perfect
I couldn't have consulted you couldn't have consulted she couldn't have consulted we couldn't have consulted you couldn't have consulted they couldn't have consulted
V-ing perfect
I couldn't have been consulting you couldn't have been consulting she couldn't have been consulting we couldn't have been consulting you couldn't have been consulting they couldn't have been consulting
Interrogative form
Simple form
could I consult? could you consult? could she consult? could we consult? could you consult? could they consult?
V-ing form
could I be consulting? could you be consulting? could she be consulting? could we be consulting? could you be consulting? could they be consulting?
Perfect
could I have consulted? could you have consulted? could she 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 she have been consulting? could we have been consulting? could you have been consulting? could they have been consulting?
Interro-negative form
Simple form
couldn't I consult? couldn't you consult? couldn't she consult? couldn't we consult? couldn't you consult? couldn't they consult?
V-ing form
couldn't I be consulting? couldn't you be consulting? couldn't she be consulting? couldn't we be consulting? couldn't you be consulting? couldn't they be consulting?
Perfect
couldn't I have consulted? couldn't you have consulted? couldn't she have consulted? couldn't we have consulted? couldn't you have consulted? couldn't they have consulted?
V-ing perfect
couldn't I have been consulting? couldn't you have been consulting? couldn't she have been consulting? couldn't we have been consulting? couldn't you have been consulting? couldn't they have been consulting?