I could decree you could decree she could decree we could decree you could decree they could decree
V-ing form
I could be decreeing you could be decreeing she could be decreeing we could be decreeing you could be decreeing they could be decreeing
Perfect
I could have decreed you could have decreed she could have decreed we could have decreed you could have decreed they could have decreed
V-ing perfect
I could have been decreeing you could have been decreeing she could have been decreeing we could have been decreeing you could have been decreeing they could have been decreeing
Negation
Simple form
I could not decree you could not decree she could not decree we could not decree you could not decree they could not decree
V-ing form
I could not be decreeing you could not be decreeing she could not be decreeing we could not be decreeing you could not be decreeing they could not be decreeing
Perfect
I could not have decreed you could not have decreed she could not have decreed we could not have decreed you could not have decreed they could not have decreed
V-ing perfect
I could not have been decreeing you could not have been decreeing she could not have been decreeing we could not have been decreeing you could not have been decreeing they could not have been decreeing
Interrogative form
Simple form
could I decree? could you decree? could she decree? could we decree? could you decree? could they decree?
V-ing form
could I be decreeing? could you be decreeing? could she be decreeing? could we be decreeing? could you be decreeing? could they be decreeing?
Perfect
could I have decreed? could you have decreed? could she have decreed? could we have decreed? could you have decreed? could they have decreed?
V-ing perfect
could I have been decreeing? could you have been decreeing? could she have been decreeing? could we have been decreeing? could you have been decreeing? could they have been decreeing?
Interro-negative form
Simple form
could I not decree? could you not decree? could she not decree? could we not decree? could you not decree? could they not decree?
V-ing form
could I not be decreeing? could you not be decreeing? could she not be decreeing? could we not be decreeing? could you not be decreeing? could they not be decreeing?
Perfect
could I not have decreed? could you not have decreed? could she not have decreed? could we not have decreed? could you not have decreed? could they not have decreed?
V-ing perfect
could I not have been decreeing? could you not have been decreeing? could she not have been decreeing? could we not have been decreeing? could you not have been decreeing? could they not have been decreeing?