I could unpack you could unpack he could unpack we could unpack you could unpack they could unpack
V-ing form
I could be unpacking you could be unpacking he could be unpacking we could be unpacking you could be unpacking they could be unpacking
Perfect
I could have unpacked you could have unpacked he could have unpacked we could have unpacked you could have unpacked they could have unpacked
V-ing perfect
I could have been unpacking you could have been unpacking he could have been unpacking we could have been unpacking you could have been unpacking they could have been unpacking
Negation
Simple form
I couldn't unpack you couldn't unpack he couldn't unpack we couldn't unpack you couldn't unpack they couldn't unpack
V-ing form
I couldn't be unpacking you couldn't be unpacking he couldn't be unpacking we couldn't be unpacking you couldn't be unpacking they couldn't be unpacking
Perfect
I couldn't have unpacked you couldn't have unpacked he couldn't have unpacked we couldn't have unpacked you couldn't have unpacked they couldn't have unpacked
V-ing perfect
I couldn't have been unpacking you couldn't have been unpacking he couldn't have been unpacking we couldn't have been unpacking you couldn't have been unpacking they couldn't have been unpacking
Interrogative form
Simple form
could I unpack? could you unpack? could he unpack? could we unpack? could you unpack? could they unpack?
V-ing form
could I be unpacking? could you be unpacking? could he be unpacking? could we be unpacking? could you be unpacking? could they be unpacking?
Perfect
could I have unpacked? could you have unpacked? could he have unpacked? could we have unpacked? could you have unpacked? could they have unpacked?
V-ing perfect
could I have been unpacking? could you have been unpacking? could he have been unpacking? could we have been unpacking? could you have been unpacking? could they have been unpacking?
Interro-negative form
Simple form
couldn't I unpack? couldn't you unpack? couldn't he unpack? couldn't we unpack? couldn't you unpack? couldn't they unpack?
V-ing form
couldn't I be unpacking? couldn't you be unpacking? couldn't he be unpacking? couldn't we be unpacking? couldn't you be unpacking? couldn't they be unpacking?
Perfect
couldn't I have unpacked? couldn't you have unpacked? couldn't he have unpacked? couldn't we have unpacked? couldn't you have unpacked? couldn't they have unpacked?
V-ing perfect
couldn't I have been unpacking? couldn't you have been unpacking? couldn't he have been unpacking? couldn't we have been unpacking? couldn't you have been unpacking? couldn't they have been unpacking?