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