I could usurp you could usurp she could usurp we could usurp you could usurp they could usurp
V-ing form
I could be usurping you could be usurping she could be usurping we could be usurping you could be usurping they could be usurping
Perfect
I could have usurped you could have usurped she could have usurped we could have usurped you could have usurped they could have usurped
V-ing perfect
I could have been usurping you could have been usurping she could have been usurping we could have been usurping you could have been usurping they could have been usurping
Negation
Simple form
I could not usurp you could not usurp she could not usurp we could not usurp you could not usurp they could not usurp
V-ing form
I could not be usurping you could not be usurping she could not be usurping we could not be usurping you could not be usurping they could not be usurping
Perfect
I could not have usurped you could not have usurped she could not have usurped we could not have usurped you could not have usurped they could not have usurped
V-ing perfect
I could not have been usurping you could not have been usurping she could not have been usurping we could not have been usurping you could not have been usurping they could not have been usurping
Interrogative form
Simple form
could I usurp? could you usurp? could she usurp? could we usurp? could you usurp? could they usurp?
V-ing form
could I be usurping? could you be usurping? could she be usurping? could we be usurping? could you be usurping? could they be usurping?
Perfect
could I have usurped? could you have usurped? could she have usurped? could we have usurped? could you have usurped? could they have usurped?
V-ing perfect
could I have been usurping? could you have been usurping? could she have been usurping? could we have been usurping? could you have been usurping? could they have been usurping?
Interro-negative form
Simple form
could I not usurp? could you not usurp? could she not usurp? could we not usurp? could you not usurp? could they not usurp?
V-ing form
could I not be usurping? could you not be usurping? could she not be usurping? could we not be usurping? could you not be usurping? could they not be usurping?
Perfect
could I not have usurped? could you not have usurped? could she not have usurped? could we not have usurped? could you not have usurped? could they not have usurped?
V-ing perfect
could I not have been usurping? could you not have been usurping? could she not have been usurping? could we not have been usurping? could you not have been usurping? could they not have been usurping?