I could play you could play he could play we could play you could play they could play
V-ing form
I could be playing you could be playing he could be playing we could be playing you could be playing they could be playing
Perfect
I could have played you could have played he could have played we could have played you could have played they could have played
V-ing perfect
I could have been playing you could have been playing he could have been playing we could have been playing you could have been playing they could have been playing
Negation
Simple form
I couldn't play you couldn't play he couldn't play we couldn't play you couldn't play they couldn't play
V-ing form
I couldn't be playing you couldn't be playing he couldn't be playing we couldn't be playing you couldn't be playing they couldn't be playing
Perfect
I couldn't have played you couldn't have played he couldn't have played we couldn't have played you couldn't have played they couldn't have played
V-ing perfect
I couldn't have been playing you couldn't have been playing he couldn't have been playing we couldn't have been playing you couldn't have been playing they couldn't have been playing
Interrogative form
Simple form
could I play? could you play? could he play? could we play? could you play? could they play?
V-ing form
could I be playing? could you be playing? could he be playing? could we be playing? could you be playing? could they be playing?
Perfect
could I have played? could you have played? could he have played? could we have played? could you have played? could they have played?
V-ing perfect
could I have been playing? could you have been playing? could he have been playing? could we have been playing? could you have been playing? could they have been playing?
Interro-negative form
Simple form
couldn't I play? couldn't you play? couldn't he play? couldn't we play? couldn't you play? couldn't they play?
V-ing form
couldn't I be playing? couldn't you be playing? couldn't he be playing? couldn't we be playing? couldn't you be playing? couldn't they be playing?
Perfect
couldn't I have played? couldn't you have played? couldn't he have played? couldn't we have played? couldn't you have played? couldn't they have played?
V-ing perfect
couldn't I have been playing? couldn't you have been playing? couldn't he have been playing? couldn't we have been playing? couldn't you have been playing? couldn't they have been playing?