I could promise you could promise she could promise we could promise you could promise they could promise
V-ing form
I could be promising you could be promising she could be promising we could be promising you could be promising they could be promising
Perfect
I could have promised you could have promised she could have promised we could have promised you could have promised they could have promised
V-ing perfect
I could have been promising you could have been promising she could have been promising we could have been promising you could have been promising they could have been promising
Negation
Simple form
I couldn't promise you couldn't promise she couldn't promise we couldn't promise you couldn't promise they couldn't promise
V-ing form
I couldn't be promising you couldn't be promising she couldn't be promising we couldn't be promising you couldn't be promising they couldn't be promising
Perfect
I couldn't have promised you couldn't have promised she couldn't have promised we couldn't have promised you couldn't have promised they couldn't have promised
V-ing perfect
I couldn't have been promising you couldn't have been promising she couldn't have been promising we couldn't have been promising you couldn't have been promising they couldn't have been promising
Interrogative form
Simple form
could I promise? could you promise? could she promise? could we promise? could you promise? could they promise?
V-ing form
could I be promising? could you be promising? could she be promising? could we be promising? could you be promising? could they be promising?
Perfect
could I have promised? could you have promised? could she have promised? could we have promised? could you have promised? could they have promised?
V-ing perfect
could I have been promising? could you have been promising? could she have been promising? could we have been promising? could you have been promising? could they have been promising?
Interro-negative form
Simple form
couldn't I promise? couldn't you promise? couldn't she promise? couldn't we promise? couldn't you promise? couldn't they promise?
V-ing form
couldn't I be promising? couldn't you be promising? couldn't she be promising? couldn't we be promising? couldn't you be promising? couldn't they be promising?
Perfect
couldn't I have promised? couldn't you have promised? couldn't she have promised? couldn't we have promised? couldn't you have promised? couldn't they have promised?
V-ing perfect
couldn't I have been promising? couldn't you have been promising? couldn't she have been promising? couldn't we have been promising? couldn't you have been promising? couldn't they have been promising?