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 could not french-polish you could not french-polish he could not french-polish we could not french-polish you could not french-polish they could not french-polish
V-ing form
I could not be french-polishing you could not be french-polishing he could not be french-polishing we could not be french-polishing you could not be french-polishing they could not be french-polishing
Perfect
I could not have french-polished you could not have french-polished he could not have french-polished we could not have french-polished you could not have french-polished they could not have french-polished
V-ing perfect
I could not have been french-polishing you could not have been french-polishing he could not have been french-polishing we could not have been french-polishing you could not have been french-polishing they could not 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
could I not french-polish? could you not french-polish? could he not french-polish? could we not french-polish? could you not french-polish? could they not french-polish?
V-ing form
could I not be french-polishing? could you not be french-polishing? could he not be french-polishing? could we not be french-polishing? could you not be french-polishing? could they not be french-polishing?
Perfect
could I not have french-polished? could you not have french-polished? could he not have french-polished? could we not have french-polished? could you not have french-polished? could they not have french-polished?
V-ing perfect
could I not have been french-polishing? could you not have been french-polishing? could he not have been french-polishing? could we not have been french-polishing? could you not have been french-polishing? could they not have been french-polishing?