I could retract you could retract she could retract we could retract you could retract they could retract
V-ing form
I could be retracting you could be retracting she could be retracting we could be retracting you could be retracting they could be retracting
Perfect
I could have retracted you could have retracted she 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 she could have been retracting we could have been retracting you could have been retracting they could have been retracting
Negation
Simple form
I could not retract you could not retract she could not retract we could not retract you could not retract they could not retract
V-ing form
I could not be retracting you could not be retracting she could not be retracting we could not be retracting you could not be retracting they could not be retracting
Perfect
I could not have retracted you could not have retracted she could not have retracted we could not have retracted you could not have retracted they could not have retracted
V-ing perfect
I could not have been retracting you could not have been retracting she could not have been retracting we could not have been retracting you could not have been retracting they could not have been retracting
Interrogative form
Simple form
could I retract? could you retract? could she retract? could we retract? could you retract? could they retract?
V-ing form
could I be retracting? could you be retracting? could she be retracting? could we be retracting? could you be retracting? could they be retracting?
Perfect
could I have retracted? could you have retracted? could she 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 she have been retracting? could we have been retracting? could you have been retracting? could they have been retracting?
Interro-negative form
Simple form
could I not retract? could you not retract? could she not retract? could we not retract? could you not retract? could they not retract?
V-ing form
could I not be retracting? could you not be retracting? could she not be retracting? could we not be retracting? could you not be retracting? could they not be retracting?
Perfect
could I not have retracted? could you not have retracted? could she not have retracted? could we not have retracted? could you not have retracted? could they not have retracted?
V-ing perfect
could I not have been retracting? could you not have been retracting? could she not have been retracting? could we not have been retracting? could you not have been retracting? could they not have been retracting?