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 couldn't abandon you couldn't abandon he couldn't abandon we couldn't abandon you couldn't abandon they couldn't abandon
V-ing form
I couldn't be abandoning you couldn't be abandoning he couldn't be abandoning we couldn't be abandoning you couldn't be abandoning they couldn't be abandoning
Perfect
I couldn't have abandoned you couldn't have abandoned he couldn't have abandoned we couldn't have abandoned you couldn't have abandoned they couldn't have abandoned
V-ing perfect
I couldn't have been abandoning you couldn't have been abandoning he couldn't have been abandoning we couldn't have been abandoning you couldn't have been abandoning they couldn't 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
couldn't I abandon? couldn't you abandon? couldn't he abandon? couldn't we abandon? couldn't you abandon? couldn't they abandon?
V-ing form
couldn't I be abandoning? couldn't you be abandoning? couldn't he be abandoning? couldn't we be abandoning? couldn't you be abandoning? couldn't they be abandoning?
Perfect
couldn't I have abandoned? couldn't you have abandoned? couldn't he have abandoned? couldn't we have abandoned? couldn't you have abandoned? couldn't they have abandoned?
V-ing perfect
couldn't I have been abandoning? couldn't you have been abandoning? couldn't he have been abandoning? couldn't we have been abandoning? couldn't you have been abandoning? couldn't they have been abandoning?