I could perfume you could perfume he could perfume we could perfume you could perfume they could perfume
V-ing form
I could be perfuming you could be perfuming he could be perfuming we could be perfuming you could be perfuming they could be perfuming
Perfect
I could have perfumed you could have perfumed he could have perfumed we could have perfumed you could have perfumed they could have perfumed
V-ing perfect
I could have been perfuming you could have been perfuming he could have been perfuming we could have been perfuming you could have been perfuming they could have been perfuming
Negation
Simple form
I could not perfume you could not perfume he could not perfume we could not perfume you could not perfume they could not perfume
V-ing form
I could not be perfuming you could not be perfuming he could not be perfuming we could not be perfuming you could not be perfuming they could not be perfuming
Perfect
I could not have perfumed you could not have perfumed he could not have perfumed we could not have perfumed you could not have perfumed they could not have perfumed
V-ing perfect
I could not have been perfuming you could not have been perfuming he could not have been perfuming we could not have been perfuming you could not have been perfuming they could not have been perfuming
Interrogative form
Simple form
could I perfume? could you perfume? could he perfume? could we perfume? could you perfume? could they perfume?
V-ing form
could I be perfuming? could you be perfuming? could he be perfuming? could we be perfuming? could you be perfuming? could they be perfuming?
Perfect
could I have perfumed? could you have perfumed? could he have perfumed? could we have perfumed? could you have perfumed? could they have perfumed?
V-ing perfect
could I have been perfuming? could you have been perfuming? could he have been perfuming? could we have been perfuming? could you have been perfuming? could they have been perfuming?
Interro-negative form
Simple form
could I not perfume? could you not perfume? could he not perfume? could we not perfume? could you not perfume? could they not perfume?
V-ing form
could I not be perfuming? could you not be perfuming? could he not be perfuming? could we not be perfuming? could you not be perfuming? could they not be perfuming?
Perfect
could I not have perfumed? could you not have perfumed? could he not have perfumed? could we not have perfumed? could you not have perfumed? could they not have perfumed?
V-ing perfect
could I not have been perfuming? could you not have been perfuming? could he not have been perfuming? could we not have been perfuming? could you not have been perfuming? could they not have been perfuming?