I could dock you could dock he could dock we could dock you could dock they could dock
V-ing form
I could be docking you could be docking he could be docking we could be docking you could be docking they could be docking
Perfect
I could have docked you could have docked he could have docked we could have docked you could have docked they could have docked
V-ing perfect
I could have been docking you could have been docking he could have been docking we could have been docking you could have been docking they could have been docking
Negation
Simple form
I could not dock you could not dock he could not dock we could not dock you could not dock they could not dock
V-ing form
I could not be docking you could not be docking he could not be docking we could not be docking you could not be docking they could not be docking
Perfect
I could not have docked you could not have docked he could not have docked we could not have docked you could not have docked they could not have docked
V-ing perfect
I could not have been docking you could not have been docking he could not have been docking we could not have been docking you could not have been docking they could not have been docking
Interrogative form
Simple form
could I dock? could you dock? could he dock? could we dock? could you dock? could they dock?
V-ing form
could I be docking? could you be docking? could he be docking? could we be docking? could you be docking? could they be docking?
Perfect
could I have docked? could you have docked? could he have docked? could we have docked? could you have docked? could they have docked?
V-ing perfect
could I have been docking? could you have been docking? could he have been docking? could we have been docking? could you have been docking? could they have been docking?
Interro-negative form
Simple form
could I not dock? could you not dock? could he not dock? could we not dock? could you not dock? could they not dock?
V-ing form
could I not be docking? could you not be docking? could he not be docking? could we not be docking? could you not be docking? could they not be docking?
Perfect
could I not have docked? could you not have docked? could he not have docked? could we not have docked? could you not have docked? could they not have docked?
V-ing perfect
could I not have been docking? could you not have been docking? could he not have been docking? could we not have been docking? could you not have been docking? could they not have been docking?