English verb conjugation
COULD DOCK

Regular verb: dock - docked - docked

Affirmation

Simple form	V-ing form
I could dock you could dock he could dock we could dock you could dock they could dock	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	V-ing 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	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	V-ing form
I couldn't dock you couldn't dock he couldn't dock we couldn't dock you couldn't dock they couldn't dock	I couldn't be docking you couldn't be docking he couldn't be docking we couldn't be docking you couldn't be docking they couldn't be docking
Perfect	V-ing perfect
I couldn't have docked you couldn't have docked he couldn't have docked we couldn't have docked you couldn't have docked they couldn't have docked	I couldn't have been docking you couldn't have been docking he couldn't have been docking we couldn't have been docking you couldn't have been docking they couldn't have been docking

Interrogative form

Simple form	V-ing form
could I dock? could you dock? could he dock? could we dock? could you dock? could they dock?	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	V-ing 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?	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	V-ing form
couldn't I dock? couldn't you dock? couldn't he dock? couldn't we dock? couldn't you dock? couldn't they dock?	couldn't I be docking? couldn't you be docking? couldn't he be docking? couldn't we be docking? couldn't you be docking? couldn't they be docking?
Perfect	V-ing perfect
couldn't I have docked? couldn't you have docked? couldn't he have docked? couldn't we have docked? couldn't you have docked? couldn't they have docked?	couldn't I have been docking? couldn't you have been docking? couldn't he have been docking? couldn't we have been docking? couldn't you have been docking? couldn't they have been docking?