I could doom you could doom he could doom we could doom you could doom they could doom
V-ing form
I could be dooming you could be dooming he could be dooming we could be dooming you could be dooming they could be dooming
Perfect
I could have doomed you could have doomed he could have doomed we could have doomed you could have doomed they could have doomed
V-ing perfect
I could have been dooming you could have been dooming he could have been dooming we could have been dooming you could have been dooming they could have been dooming
Negation
Simple form
I could not doom you could not doom he could not doom we could not doom you could not doom they could not doom
V-ing form
I could not be dooming you could not be dooming he could not be dooming we could not be dooming you could not be dooming they could not be dooming
Perfect
I could not have doomed you could not have doomed he could not have doomed we could not have doomed you could not have doomed they could not have doomed
V-ing perfect
I could not have been dooming you could not have been dooming he could not have been dooming we could not have been dooming you could not have been dooming they could not have been dooming
Interrogative form
Simple form
could I doom? could you doom? could he doom? could we doom? could you doom? could they doom?
V-ing form
could I be dooming? could you be dooming? could he be dooming? could we be dooming? could you be dooming? could they be dooming?
Perfect
could I have doomed? could you have doomed? could he have doomed? could we have doomed? could you have doomed? could they have doomed?
V-ing perfect
could I have been dooming? could you have been dooming? could he have been dooming? could we have been dooming? could you have been dooming? could they have been dooming?
Interro-negative form
Simple form
could I not doom? could you not doom? could he not doom? could we not doom? could you not doom? could they not doom?
V-ing form
could I not be dooming? could you not be dooming? could he not be dooming? could we not be dooming? could you not be dooming? could they not be dooming?
Perfect
could I not have doomed? could you not have doomed? could he not have doomed? could we not have doomed? could you not have doomed? could they not have doomed?
V-ing perfect
could I not have been dooming? could you not have been dooming? could he not have been dooming? could we not have been dooming? could you not have been dooming? could they not have been dooming?