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