I could chasten you could chasten he could chasten we could chasten you could chasten they could chasten
V-ing form
I could be chastening you could be chastening he could be chastening we could be chastening you could be chastening they could be chastening
Perfect
I could have chastened you could have chastened he could have chastened we could have chastened you could have chastened they could have chastened
V-ing perfect
I could have been chastening you could have been chastening he could have been chastening we could have been chastening you could have been chastening they could have been chastening
Negation
Simple form
I could not chasten you could not chasten he could not chasten we could not chasten you could not chasten they could not chasten
V-ing form
I could not be chastening you could not be chastening he could not be chastening we could not be chastening you could not be chastening they could not be chastening
Perfect
I could not have chastened you could not have chastened he could not have chastened we could not have chastened you could not have chastened they could not have chastened
V-ing perfect
I could not have been chastening you could not have been chastening he could not have been chastening we could not have been chastening you could not have been chastening they could not have been chastening
Interrogative form
Simple form
could I chasten? could you chasten? could he chasten? could we chasten? could you chasten? could they chasten?
V-ing form
could I be chastening? could you be chastening? could he be chastening? could we be chastening? could you be chastening? could they be chastening?
Perfect
could I have chastened? could you have chastened? could he have chastened? could we have chastened? could you have chastened? could they have chastened?
V-ing perfect
could I have been chastening? could you have been chastening? could he have been chastening? could we have been chastening? could you have been chastening? could they have been chastening?
Interro-negative form
Simple form
could I not chasten? could you not chasten? could he not chasten? could we not chasten? could you not chasten? could they not chasten?
V-ing form
could I not be chastening? could you not be chastening? could he not be chastening? could we not be chastening? could you not be chastening? could they not be chastening?
Perfect
could I not have chastened? could you not have chastened? could he not have chastened? could we not have chastened? could you not have chastened? could they not have chastened?
V-ing perfect
could I not have been chastening? could you not have been chastening? could he not have been chastening? could we not have been chastening? could you not have been chastening? could they not have been chastening?