I could plume you could plume he could plume we could plume you could plume they could plume
V-ing form
I could be pluming you could be pluming he could be pluming we could be pluming you could be pluming they could be pluming
Perfect
I could have plumed you could have plumed he could have plumed we could have plumed you could have plumed they could have plumed
V-ing perfect
I could have been pluming you could have been pluming he could have been pluming we could have been pluming you could have been pluming they could have been pluming
Negation
Simple form
I could not plume you could not plume he could not plume we could not plume you could not plume they could not plume
V-ing form
I could not be pluming you could not be pluming he could not be pluming we could not be pluming you could not be pluming they could not be pluming
Perfect
I could not have plumed you could not have plumed he could not have plumed we could not have plumed you could not have plumed they could not have plumed
V-ing perfect
I could not have been pluming you could not have been pluming he could not have been pluming we could not have been pluming you could not have been pluming they could not have been pluming
Interrogative form
Simple form
could I plume? could you plume? could he plume? could we plume? could you plume? could they plume?
V-ing form
could I be pluming? could you be pluming? could he be pluming? could we be pluming? could you be pluming? could they be pluming?
Perfect
could I have plumed? could you have plumed? could he have plumed? could we have plumed? could you have plumed? could they have plumed?
V-ing perfect
could I have been pluming? could you have been pluming? could he have been pluming? could we have been pluming? could you have been pluming? could they have been pluming?
Interro-negative form
Simple form
could I not plume? could you not plume? could he not plume? could we not plume? could you not plume? could they not plume?
V-ing form
could I not be pluming? could you not be pluming? could he not be pluming? could we not be pluming? could you not be pluming? could they not be pluming?
Perfect
could I not have plumed? could you not have plumed? could he not have plumed? could we not have plumed? could you not have plumed? could they not have plumed?
V-ing perfect
could I not have been pluming? could you not have been pluming? could he not have been pluming? could we not have been pluming? could you not have been pluming? could they not have been pluming?