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 couldn't perfume you couldn't perfume he couldn't perfume we couldn't perfume you couldn't perfume they couldn't perfume
V-ing form
I couldn't be perfuming you couldn't be perfuming he couldn't be perfuming we couldn't be perfuming you couldn't be perfuming they couldn't be perfuming
Perfect
I couldn't have perfumed you couldn't have perfumed he couldn't have perfumed we couldn't have perfumed you couldn't have perfumed they couldn't have perfumed
V-ing perfect
I couldn't have been perfuming you couldn't have been perfuming he couldn't have been perfuming we couldn't have been perfuming you couldn't have been perfuming they couldn't 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
couldn't I perfume? couldn't you perfume? couldn't he perfume? couldn't we perfume? couldn't you perfume? couldn't they perfume?
V-ing form
couldn't I be perfuming? couldn't you be perfuming? couldn't he be perfuming? couldn't we be perfuming? couldn't you be perfuming? couldn't they be perfuming?
Perfect
couldn't I have perfumed? couldn't you have perfumed? couldn't he have perfumed? couldn't we have perfumed? couldn't you have perfumed? couldn't they have perfumed?
V-ing perfect
couldn't I have been perfuming? couldn't you have been perfuming? couldn't he have been perfuming? couldn't we have been perfuming? couldn't you have been perfuming? couldn't they have been perfuming?