I could decline you could decline he could decline we could decline you could decline they could decline
V-ing form
I could be declining you could be declining he could be declining we could be declining you could be declining they could be declining
Perfect
I could have declined you could have declined he could have declined we could have declined you could have declined they could have declined
V-ing perfect
I could have been declining you could have been declining he could have been declining we could have been declining you could have been declining they could have been declining
Negation
Simple form
I could not decline you could not decline he could not decline we could not decline you could not decline they could not decline
V-ing form
I could not be declining you could not be declining he could not be declining we could not be declining you could not be declining they could not be declining
Perfect
I could not have declined you could not have declined he could not have declined we could not have declined you could not have declined they could not have declined
V-ing perfect
I could not have been declining you could not have been declining he could not have been declining we could not have been declining you could not have been declining they could not have been declining
Interrogative form
Simple form
could I decline? could you decline? could he decline? could we decline? could you decline? could they decline?
V-ing form
could I be declining? could you be declining? could he be declining? could we be declining? could you be declining? could they be declining?
Perfect
could I have declined? could you have declined? could he have declined? could we have declined? could you have declined? could they have declined?
V-ing perfect
could I have been declining? could you have been declining? could he have been declining? could we have been declining? could you have been declining? could they have been declining?
Interro-negative form
Simple form
could I not decline? could you not decline? could he not decline? could we not decline? could you not decline? could they not decline?
V-ing form
could I not be declining? could you not be declining? could he not be declining? could we not be declining? could you not be declining? could they not be declining?
Perfect
could I not have declined? could you not have declined? could he not have declined? could we not have declined? could you not have declined? could they not have declined?
V-ing perfect
could I not have been declining? could you not have been declining? could he not have been declining? could we not have been declining? could you not have been declining? could they not have been declining?