I could exfoliate you could exfoliate he could exfoliate we could exfoliate you could exfoliate they could exfoliate
V-ing form
I could be exfoliating you could be exfoliating he could be exfoliating we could be exfoliating you could be exfoliating they could be exfoliating
Perfect
I could have exfoliated you could have exfoliated he could have exfoliated we could have exfoliated you could have exfoliated they could have exfoliated
V-ing perfect
I could have been exfoliating you could have been exfoliating he could have been exfoliating we could have been exfoliating you could have been exfoliating they could have been exfoliating
Negation
Simple form
I could not exfoliate you could not exfoliate he could not exfoliate we could not exfoliate you could not exfoliate they could not exfoliate
V-ing form
I could not be exfoliating you could not be exfoliating he could not be exfoliating we could not be exfoliating you could not be exfoliating they could not be exfoliating
Perfect
I could not have exfoliated you could not have exfoliated he could not have exfoliated we could not have exfoliated you could not have exfoliated they could not have exfoliated
V-ing perfect
I could not have been exfoliating you could not have been exfoliating he could not have been exfoliating we could not have been exfoliating you could not have been exfoliating they could not have been exfoliating
Interrogative form
Simple form
could I exfoliate? could you exfoliate? could he exfoliate? could we exfoliate? could you exfoliate? could they exfoliate?
V-ing form
could I be exfoliating? could you be exfoliating? could he be exfoliating? could we be exfoliating? could you be exfoliating? could they be exfoliating?
Perfect
could I have exfoliated? could you have exfoliated? could he have exfoliated? could we have exfoliated? could you have exfoliated? could they have exfoliated?
V-ing perfect
could I have been exfoliating? could you have been exfoliating? could he have been exfoliating? could we have been exfoliating? could you have been exfoliating? could they have been exfoliating?
Interro-negative form
Simple form
could I not exfoliate? could you not exfoliate? could he not exfoliate? could we not exfoliate? could you not exfoliate? could they not exfoliate?
V-ing form
could I not be exfoliating? could you not be exfoliating? could he not be exfoliating? could we not be exfoliating? could you not be exfoliating? could they not be exfoliating?
Perfect
could I not have exfoliated? could you not have exfoliated? could he not have exfoliated? could we not have exfoliated? could you not have exfoliated? could they not have exfoliated?
V-ing perfect
could I not have been exfoliating? could you not have been exfoliating? could he not have been exfoliating? could we not have been exfoliating? could you not have been exfoliating? could they not have been exfoliating?