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 couldn't begone you couldn't begone she couldn't begone we couldn't begone you couldn't begone they couldn't begone
V-ing form
I couldn't be begoning you couldn't be begoning she couldn't be begoning we couldn't be begoning you couldn't be begoning they couldn't be begoning
Perfect
I couldn't have begoned you couldn't have begoned she couldn't have begoned we couldn't have begoned you couldn't have begoned they couldn't have begoned
V-ing perfect
I couldn't have been begoning you couldn't have been begoning she couldn't have been begoning we couldn't have been begoning you couldn't have been begoning they couldn't 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
couldn't I begone? couldn't you begone? couldn't she begone? couldn't we begone? couldn't you begone? couldn't they begone?
V-ing form
couldn't I be begoning? couldn't you be begoning? couldn't she be begoning? couldn't we be begoning? couldn't you be begoning? couldn't they be begoning?
Perfect
couldn't I have begoned? couldn't you have begoned? couldn't she have begoned? couldn't we have begoned? couldn't you have begoned? couldn't they have begoned?
V-ing perfect
couldn't I have been begoning? couldn't you have been begoning? couldn't she have been begoning? couldn't we have been begoning? couldn't you have been begoning? couldn't they have been begoning?