I could french-polish you could french-polish he could french-polish we could french-polish you could french-polish they could french-polish
V-ing form
I could be french-polishing you could be french-polishing he could be french-polishing we could be french-polishing you could be french-polishing they could be french-polishing
Perfect
I could have french-polished you could have french-polished he could have french-polished we could have french-polished you could have french-polished they could have french-polished
V-ing perfect
I could have been french-polishing you could have been french-polishing he could have been french-polishing we could have been french-polishing you could have been french-polishing they could have been french-polishing
Negation
Simple form
I couldn't french-polish you couldn't french-polish he couldn't french-polish we couldn't french-polish you couldn't french-polish they couldn't french-polish
V-ing form
I couldn't be french-polishing you couldn't be french-polishing he couldn't be french-polishing we couldn't be french-polishing you couldn't be french-polishing they couldn't be french-polishing
Perfect
I couldn't have french-polished you couldn't have french-polished he couldn't have french-polished we couldn't have french-polished you couldn't have french-polished they couldn't have french-polished
V-ing perfect
I couldn't have been french-polishing you couldn't have been french-polishing he couldn't have been french-polishing we couldn't have been french-polishing you couldn't have been french-polishing they couldn't have been french-polishing
Interrogative form
Simple form
could I french-polish? could you french-polish? could he french-polish? could we french-polish? could you french-polish? could they french-polish?
V-ing form
could I be french-polishing? could you be french-polishing? could he be french-polishing? could we be french-polishing? could you be french-polishing? could they be french-polishing?
Perfect
could I have french-polished? could you have french-polished? could he have french-polished? could we have french-polished? could you have french-polished? could they have french-polished?
V-ing perfect
could I have been french-polishing? could you have been french-polishing? could he have been french-polishing? could we have been french-polishing? could you have been french-polishing? could they have been french-polishing?
Interro-negative form
Simple form
couldn't I french-polish? couldn't you french-polish? couldn't he french-polish? couldn't we french-polish? couldn't you french-polish? couldn't they french-polish?
V-ing form
couldn't I be french-polishing? couldn't you be french-polishing? couldn't he be french-polishing? couldn't we be french-polishing? couldn't you be french-polishing? couldn't they be french-polishing?
Perfect
couldn't I have french-polished? couldn't you have french-polished? couldn't he have french-polished? couldn't we have french-polished? couldn't you have french-polished? couldn't they have french-polished?
V-ing perfect
couldn't I have been french-polishing? couldn't you have been french-polishing? couldn't he have been french-polishing? couldn't we have been french-polishing? couldn't you have been french-polishing? couldn't they have been french-polishing?