English verb conjugation
COULD FURBISH

Regular verb: furbish - furbished - furbished

Affirmation

Simple form	V-ing form
I could furbish you could furbish he could furbish we could furbish you could furbish they could furbish	I could be furbishing you could be furbishing he could be furbishing we could be furbishing you could be furbishing they could be furbishing
Perfect	V-ing perfect
I could have furbished you could have furbished he could have furbished we could have furbished you could have furbished they could have furbished	I could have been furbishing you could have been furbishing he could have been furbishing we could have been furbishing you could have been furbishing they could have been furbishing

Negation

Simple form	V-ing form
I couldn't furbish you couldn't furbish he couldn't furbish we couldn't furbish you couldn't furbish they couldn't furbish	I couldn't be furbishing you couldn't be furbishing he couldn't be furbishing we couldn't be furbishing you couldn't be furbishing they couldn't be furbishing
Perfect	V-ing perfect
I couldn't have furbished you couldn't have furbished he couldn't have furbished we couldn't have furbished you couldn't have furbished they couldn't have furbished	I couldn't have been furbishing you couldn't have been furbishing he couldn't have been furbishing we couldn't have been furbishing you couldn't have been furbishing they couldn't have been furbishing

Interrogative form

Simple form	V-ing form
could I furbish? could you furbish? could he furbish? could we furbish? could you furbish? could they furbish?	could I be furbishing? could you be furbishing? could he be furbishing? could we be furbishing? could you be furbishing? could they be furbishing?
Perfect	V-ing perfect
could I have furbished? could you have furbished? could he have furbished? could we have furbished? could you have furbished? could they have furbished?	could I have been furbishing? could you have been furbishing? could he have been furbishing? could we have been furbishing? could you have been furbishing? could they have been furbishing?

Interro-negative form

Simple form	V-ing form
couldn't I furbish? couldn't you furbish? couldn't he furbish? couldn't we furbish? couldn't you furbish? couldn't they furbish?	couldn't I be furbishing? couldn't you be furbishing? couldn't he be furbishing? couldn't we be furbishing? couldn't you be furbishing? couldn't they be furbishing?
Perfect	V-ing perfect
couldn't I have furbished? couldn't you have furbished? couldn't he have furbished? couldn't we have furbished? couldn't you have furbished? couldn't they have furbished?	couldn't I have been furbishing? couldn't you have been furbishing? couldn't he have been furbishing? couldn't we have been furbishing? couldn't you have been furbishing? couldn't they have been furbishing?