I could allege you could allege he could allege we could allege you could allege they could allege
V-ing form
I could be alleging you could be alleging he could be alleging we could be alleging you could be alleging they could be alleging
Perfect
I could have alleged you could have alleged he could have alleged we could have alleged you could have alleged they could have alleged
V-ing perfect
I could have been alleging you could have been alleging he could have been alleging we could have been alleging you could have been alleging they could have been alleging
Negation
Simple form
I could not allege you could not allege he could not allege we could not allege you could not allege they could not allege
V-ing form
I could not be alleging you could not be alleging he could not be alleging we could not be alleging you could not be alleging they could not be alleging
Perfect
I could not have alleged you could not have alleged he could not have alleged we could not have alleged you could not have alleged they could not have alleged
V-ing perfect
I could not have been alleging you could not have been alleging he could not have been alleging we could not have been alleging you could not have been alleging they could not have been alleging
Interrogative form
Simple form
could I allege? could you allege? could he allege? could we allege? could you allege? could they allege?
V-ing form
could I be alleging? could you be alleging? could he be alleging? could we be alleging? could you be alleging? could they be alleging?
Perfect
could I have alleged? could you have alleged? could he have alleged? could we have alleged? could you have alleged? could they have alleged?
V-ing perfect
could I have been alleging? could you have been alleging? could he have been alleging? could we have been alleging? could you have been alleging? could they have been alleging?
Interro-negative form
Simple form
could I not allege? could you not allege? could he not allege? could we not allege? could you not allege? could they not allege?
V-ing form
could I not be alleging? could you not be alleging? could he not be alleging? could we not be alleging? could you not be alleging? could they not be alleging?
Perfect
could I not have alleged? could you not have alleged? could he not have alleged? could we not have alleged? could you not have alleged? could they not have alleged?
V-ing perfect
could I not have been alleging? could you not have been alleging? could he not have been alleging? could we not have been alleging? could you not have been alleging? could they not have been alleging?