I could decree you could decree he could decree we could decree you could decree they could decree
V-ing form
I could be decreeing you could be decreeing he could be decreeing we could be decreeing you could be decreeing they could be decreeing
Perfect
I could have decreed you could have decreed he 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 he could have been decreeing we could have been decreeing you could have been decreeing they could have been decreeing
Negation
Simple form
I couldn't decree you couldn't decree he couldn't decree we couldn't decree you couldn't decree they couldn't decree
V-ing form
I couldn't be decreeing you couldn't be decreeing he couldn't be decreeing we couldn't be decreeing you couldn't be decreeing they couldn't be decreeing
Perfect
I couldn't have decreed you couldn't have decreed he couldn't have decreed we couldn't have decreed you couldn't have decreed they couldn't have decreed
V-ing perfect
I couldn't have been decreeing you couldn't have been decreeing he couldn't have been decreeing we couldn't have been decreeing you couldn't have been decreeing they couldn't have been decreeing
Interrogative form
Simple form
could I decree? could you decree? could he decree? could we decree? could you decree? could they decree?
V-ing form
could I be decreeing? could you be decreeing? could he be decreeing? could we be decreeing? could you be decreeing? could they be decreeing?
Perfect
could I have decreed? could you have decreed? could he 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 he have been decreeing? could we have been decreeing? could you have been decreeing? could they have been decreeing?
Interro-negative form
Simple form
couldn't I decree? couldn't you decree? couldn't he decree? couldn't we decree? couldn't you decree? couldn't they decree?
V-ing form
couldn't I be decreeing? couldn't you be decreeing? couldn't he be decreeing? couldn't we be decreeing? couldn't you be decreeing? couldn't they be decreeing?
Perfect
couldn't I have decreed? couldn't you have decreed? couldn't he have decreed? couldn't we have decreed? couldn't you have decreed? couldn't they have decreed?
V-ing perfect
couldn't I have been decreeing? couldn't you have been decreeing? couldn't he have been decreeing? couldn't we have been decreeing? couldn't you have been decreeing? couldn't they have been decreeing?