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