I could exfoliate you could exfoliate she could exfoliate we could exfoliate you could exfoliate they could exfoliate
V-ing form
I could be exfoliating you could be exfoliating she could be exfoliating we could be exfoliating you could be exfoliating they could be exfoliating
Perfect
I could have exfoliated you could have exfoliated she 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 she could have been exfoliating we could have been exfoliating you could have been exfoliating they could have been exfoliating
Negation
Simple form
I couldn't exfoliate you couldn't exfoliate she couldn't exfoliate we couldn't exfoliate you couldn't exfoliate they couldn't exfoliate
V-ing form
I couldn't be exfoliating you couldn't be exfoliating she couldn't be exfoliating we couldn't be exfoliating you couldn't be exfoliating they couldn't be exfoliating
Perfect
I couldn't have exfoliated you couldn't have exfoliated she couldn't have exfoliated we couldn't have exfoliated you couldn't have exfoliated they couldn't have exfoliated
V-ing perfect
I couldn't have been exfoliating you couldn't have been exfoliating she couldn't have been exfoliating we couldn't have been exfoliating you couldn't have been exfoliating they couldn't have been exfoliating
Interrogative form
Simple form
could I exfoliate? could you exfoliate? could she exfoliate? could we exfoliate? could you exfoliate? could they exfoliate?
V-ing form
could I be exfoliating? could you be exfoliating? could she be exfoliating? could we be exfoliating? could you be exfoliating? could they be exfoliating?
Perfect
could I have exfoliated? could you have exfoliated? could she 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 she have been exfoliating? could we have been exfoliating? could you have been exfoliating? could they have been exfoliating?
Interro-negative form
Simple form
couldn't I exfoliate? couldn't you exfoliate? couldn't she exfoliate? couldn't we exfoliate? couldn't you exfoliate? couldn't they exfoliate?
V-ing form
couldn't I be exfoliating? couldn't you be exfoliating? couldn't she be exfoliating? couldn't we be exfoliating? couldn't you be exfoliating? couldn't they be exfoliating?
Perfect
couldn't I have exfoliated? couldn't you have exfoliated? couldn't she have exfoliated? couldn't we have exfoliated? couldn't you have exfoliated? couldn't they have exfoliated?
V-ing perfect
couldn't I have been exfoliating? couldn't you have been exfoliating? couldn't she have been exfoliating? couldn't we have been exfoliating? couldn't you have been exfoliating? couldn't they have been exfoliating?