I could begone you could begone she could begone we could begone you could begone they could begone
V-ing form
I could be begoning you could be begoning she could be begoning we could be begoning you could be begoning they could be begoning
Perfect
I could have begoned you could have begoned she could have begoned we could have begoned you could have begoned they could have begoned
V-ing perfect
I could have been begoning you could have been begoning she could have been begoning we could have been begoning you could have been begoning they could have been begoning
Negation
Simple form
I could not begone you could not begone she could not begone we could not begone you could not begone they could not begone
V-ing form
I could not be begoning you could not be begoning she could not be begoning we could not be begoning you could not be begoning they could not be begoning
Perfect
I could not have begoned you could not have begoned she could not have begoned we could not have begoned you could not have begoned they could not have begoned
V-ing perfect
I could not have been begoning you could not have been begoning she could not have been begoning we could not have been begoning you could not have been begoning they could not have been begoning
Interrogative form
Simple form
could I begone? could you begone? could she begone? could we begone? could you begone? could they begone?
V-ing form
could I be begoning? could you be begoning? could she be begoning? could we be begoning? could you be begoning? could they be begoning?
Perfect
could I have begoned? could you have begoned? could she have begoned? could we have begoned? could you have begoned? could they have begoned?
V-ing perfect
could I have been begoning? could you have been begoning? could she have been begoning? could we have been begoning? could you have been begoning? could they have been begoning?
Interro-negative form
Simple form
could I not begone? could you not begone? could she not begone? could we not begone? could you not begone? could they not begone?
V-ing form
could I not be begoning? could you not be begoning? could she not be begoning? could we not be begoning? could you not be begoning? could they not be begoning?
Perfect
could I not have begoned? could you not have begoned? could she not have begoned? could we not have begoned? could you not have begoned? could they not have begoned?
V-ing perfect
could I not have been begoning? could you not have been begoning? could she not have been begoning? could we not have been begoning? could you not have been begoning? could they not have been begoning?