I could weekend you could weekend she could weekend we could weekend you could weekend they could weekend
V-ing form
I could be weekending you could be weekending she could be weekending we could be weekending you could be weekending they could be weekending
Perfect
I could have weekended you could have weekended she could have weekended we could have weekended you could have weekended they could have weekended
V-ing perfect
I could have been weekending you could have been weekending she could have been weekending we could have been weekending you could have been weekending they could have been weekending
Negation
Simple form
I could not weekend you could not weekend she could not weekend we could not weekend you could not weekend they could not weekend
V-ing form
I could not be weekending you could not be weekending she could not be weekending we could not be weekending you could not be weekending they could not be weekending
Perfect
I could not have weekended you could not have weekended she could not have weekended we could not have weekended you could not have weekended they could not have weekended
V-ing perfect
I could not have been weekending you could not have been weekending she could not have been weekending we could not have been weekending you could not have been weekending they could not have been weekending
Interrogative form
Simple form
could I weekend? could you weekend? could she weekend? could we weekend? could you weekend? could they weekend?
V-ing form
could I be weekending? could you be weekending? could she be weekending? could we be weekending? could you be weekending? could they be weekending?
Perfect
could I have weekended? could you have weekended? could she have weekended? could we have weekended? could you have weekended? could they have weekended?
V-ing perfect
could I have been weekending? could you have been weekending? could she have been weekending? could we have been weekending? could you have been weekending? could they have been weekending?
Interro-negative form
Simple form
could I not weekend? could you not weekend? could she not weekend? could we not weekend? could you not weekend? could they not weekend?
V-ing form
could I not be weekending? could you not be weekending? could she not be weekending? could we not be weekending? could you not be weekending? could they not be weekending?
Perfect
could I not have weekended? could you not have weekended? could she not have weekended? could we not have weekended? could you not have weekended? could they not have weekended?
V-ing perfect
could I not have been weekending? could you not have been weekending? could she not have been weekending? could we not have been weekending? could you not have been weekending? could they not have been weekending?