I can unpack you can unpack he can unpack we can unpack you can unpack they can unpack
V-ing form
I can be unpacking you can be unpacking he can be unpacking we can be unpacking you can be unpacking they can be unpacking
Perfect
I can have unpacked you can have unpacked he can have unpacked we can have unpacked you can have unpacked they can have unpacked
V-ing perfect
I can have been unpacking you can have been unpacking he can have been unpacking we can have been unpacking you can have been unpacking they can have been unpacking
Negation
Simple form
I cannot unpack you cannot unpack he cannot unpack we cannot unpack you cannot unpack they cannot unpack
V-ing form
I cannot be unpacking you cannot be unpacking he cannot be unpacking we cannot be unpacking you cannot be unpacking they cannot be unpacking
Perfect
I cannot have unpacked you cannot have unpacked he cannot have unpacked we cannot have unpacked you cannot have unpacked they cannot have unpacked
V-ing perfect
I cannot have been unpacking you cannot have been unpacking he cannot have been unpacking we cannot have been unpacking you cannot have been unpacking they cannot have been unpacking
Interrogative form
Simple form
can I unpack? can you unpack? can he unpack? can we unpack? can you unpack? can they unpack?
V-ing form
can I be unpacking? can you be unpacking? can he be unpacking? can we be unpacking? can you be unpacking? can they be unpacking?
Perfect
can I have unpacked? can you have unpacked? can he have unpacked? can we have unpacked? can you have unpacked? can they have unpacked?
V-ing perfect
can I have been unpacking? can you have been unpacking? can he have been unpacking? can we have been unpacking? can you have been unpacking? can they have been unpacking?
Interro-negative form
Simple form
can I not unpack? can you not unpack? can he not unpack? can we not unpack? can you not unpack? can they not unpack?
V-ing form
can I not be unpacking? can you not be unpacking? can he not be unpacking? can we not be unpacking? can you not be unpacking? can they not be unpacking?
Perfect
can I not have unpacked? can you not have unpacked? can he not have unpacked? can we not have unpacked? can you not have unpacked? can they not have unpacked?
V-ing perfect
can I not have been unpacking? can you not have been unpacking? can he not have been unpacking? can we not have been unpacking? can you not have been unpacking? can they not have been unpacking?