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