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 couldn't allege you couldn't allege he couldn't allege we couldn't allege you couldn't allege they couldn't allege
V-ing form
I couldn't be alleging you couldn't be alleging he couldn't be alleging we couldn't be alleging you couldn't be alleging they couldn't be alleging
Perfect
I couldn't have alleged you couldn't have alleged he couldn't have alleged we couldn't have alleged you couldn't have alleged they couldn't have alleged
V-ing perfect
I couldn't have been alleging you couldn't have been alleging he couldn't have been alleging we couldn't have been alleging you couldn't have been alleging they couldn't 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
couldn't I allege? couldn't you allege? couldn't he allege? couldn't we allege? couldn't you allege? couldn't they allege?
V-ing form
couldn't I be alleging? couldn't you be alleging? couldn't he be alleging? couldn't we be alleging? couldn't you be alleging? couldn't they be alleging?
Perfect
couldn't I have alleged? couldn't you have alleged? couldn't he have alleged? couldn't we have alleged? couldn't you have alleged? couldn't they have alleged?
V-ing perfect
couldn't I have been alleging? couldn't you have been alleging? couldn't he have been alleging? couldn't we have been alleging? couldn't you have been alleging? couldn't they have been alleging?