I could abandon you could abandon he could abandon we could abandon you could abandon they could abandon
V-ing form
I could be abandoning you could be abandoning he could be abandoning we could be abandoning you could be abandoning they could be abandoning
Perfect
I could have abandoned you could have abandoned he could have abandoned we could have abandoned you could have abandoned they could have abandoned
V-ing perfect
I could have been abandoning you could have been abandoning he could have been abandoning we could have been abandoning you could have been abandoning they could have been abandoning
Negation
Simple form
I could not abandon you could not abandon he could not abandon we could not abandon you could not abandon they could not abandon
V-ing form
I could not be abandoning you could not be abandoning he could not be abandoning we could not be abandoning you could not be abandoning they could not be abandoning
Perfect
I could not have abandoned you could not have abandoned he could not have abandoned we could not have abandoned you could not have abandoned they could not have abandoned
V-ing perfect
I could not have been abandoning you could not have been abandoning he could not have been abandoning we could not have been abandoning you could not have been abandoning they could not have been abandoning
Interrogative form
Simple form
could I abandon? could you abandon? could he abandon? could we abandon? could you abandon? could they abandon?
V-ing form
could I be abandoning? could you be abandoning? could he be abandoning? could we be abandoning? could you be abandoning? could they be abandoning?
Perfect
could I have abandoned? could you have abandoned? could he have abandoned? could we have abandoned? could you have abandoned? could they have abandoned?
V-ing perfect
could I have been abandoning? could you have been abandoning? could he have been abandoning? could we have been abandoning? could you have been abandoning? could they have been abandoning?
Interro-negative form
Simple form
could I not abandon? could you not abandon? could he not abandon? could we not abandon? could you not abandon? could they not abandon?
V-ing form
could I not be abandoning? could you not be abandoning? could he not be abandoning? could we not be abandoning? could you not be abandoning? could they not be abandoning?
Perfect
could I not have abandoned? could you not have abandoned? could he not have abandoned? could we not have abandoned? could you not have abandoned? could they not have abandoned?
V-ing perfect
could I not have been abandoning? could you not have been abandoning? could he not have been abandoning? could we not have been abandoning? could you not have been abandoning? could they not have been abandoning?