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