I could club you could club she could club we could club you could club they could club
V-ing form
I could be clubbing you could be clubbing she could be clubbing we could be clubbing you could be clubbing they could be clubbing
Perfect
I could have clubbed you could have clubbed she could have clubbed we could have clubbed you could have clubbed they could have clubbed
V-ing perfect
I could have been clubbing you could have been clubbing she could have been clubbing we could have been clubbing you could have been clubbing they could have been clubbing
Negation
Simple form
I could not club you could not club she could not club we could not club you could not club they could not club
V-ing form
I could not be clubbing you could not be clubbing she could not be clubbing we could not be clubbing you could not be clubbing they could not be clubbing
Perfect
I could not have clubbed you could not have clubbed she could not have clubbed we could not have clubbed you could not have clubbed they could not have clubbed
V-ing perfect
I could not have been clubbing you could not have been clubbing she could not have been clubbing we could not have been clubbing you could not have been clubbing they could not have been clubbing
Interrogative form
Simple form
could I club? could you club? could she club? could we club? could you club? could they club?
V-ing form
could I be clubbing? could you be clubbing? could she be clubbing? could we be clubbing? could you be clubbing? could they be clubbing?
Perfect
could I have clubbed? could you have clubbed? could she have clubbed? could we have clubbed? could you have clubbed? could they have clubbed?
V-ing perfect
could I have been clubbing? could you have been clubbing? could she have been clubbing? could we have been clubbing? could you have been clubbing? could they have been clubbing?
Interro-negative form
Simple form
could I not club? could you not club? could she not club? could we not club? could you not club? could they not club?
V-ing form
could I not be clubbing? could you not be clubbing? could she not be clubbing? could we not be clubbing? could you not be clubbing? could they not be clubbing?
Perfect
could I not have clubbed? could you not have clubbed? could she not have clubbed? could we not have clubbed? could you not have clubbed? could they not have clubbed?
V-ing perfect
could I not have been clubbing? could you not have been clubbing? could she not have been clubbing? could we not have been clubbing? could you not have been clubbing? could they not have been clubbing?