I could regiment you could regiment he could regiment we could regiment you could regiment they could regiment
V-ing form
I could be regimenting you could be regimenting he could be regimenting we could be regimenting you could be regimenting they could be regimenting
Perfect
I could have regimented you could have regimented he could have regimented we could have regimented you could have regimented they could have regimented
V-ing perfect
I could have been regimenting you could have been regimenting he could have been regimenting we could have been regimenting you could have been regimenting they could have been regimenting
Negation
Simple form
I could not regiment you could not regiment he could not regiment we could not regiment you could not regiment they could not regiment
V-ing form
I could not be regimenting you could not be regimenting he could not be regimenting we could not be regimenting you could not be regimenting they could not be regimenting
Perfect
I could not have regimented you could not have regimented he could not have regimented we could not have regimented you could not have regimented they could not have regimented
V-ing perfect
I could not have been regimenting you could not have been regimenting he could not have been regimenting we could not have been regimenting you could not have been regimenting they could not have been regimenting
Interrogative form
Simple form
could I regiment? could you regiment? could he regiment? could we regiment? could you regiment? could they regiment?
V-ing form
could I be regimenting? could you be regimenting? could he be regimenting? could we be regimenting? could you be regimenting? could they be regimenting?
Perfect
could I have regimented? could you have regimented? could he have regimented? could we have regimented? could you have regimented? could they have regimented?
V-ing perfect
could I have been regimenting? could you have been regimenting? could he have been regimenting? could we have been regimenting? could you have been regimenting? could they have been regimenting?
Interro-negative form
Simple form
could I not regiment? could you not regiment? could he not regiment? could we not regiment? could you not regiment? could they not regiment?
V-ing form
could I not be regimenting? could you not be regimenting? could he not be regimenting? could we not be regimenting? could you not be regimenting? could they not be regimenting?
Perfect
could I not have regimented? could you not have regimented? could he not have regimented? could we not have regimented? could you not have regimented? could they not have regimented?
V-ing perfect
could I not have been regimenting? could you not have been regimenting? could he not have been regimenting? could we not have been regimenting? could you not have been regimenting? could they not have been regimenting?