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 can't unpack you can't unpack he can't unpack we can't unpack you can't unpack they can't unpack
V-ing form
I can't be unpacking you can't be unpacking he can't be unpacking we can't be unpacking you can't be unpacking they can't be unpacking
Perfect
I can't have unpacked you can't have unpacked he can't have unpacked we can't have unpacked you can't have unpacked they can't have unpacked
V-ing perfect
I can't have been unpacking you can't have been unpacking he can't have been unpacking we can't have been unpacking you can't have been unpacking they can't 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't I unpack? can't you unpack? can't he unpack? can't we unpack? can't you unpack? can't they unpack?
V-ing form
can't I be unpacking? can't you be unpacking? can't he be unpacking? can't we be unpacking? can't you be unpacking? can't they be unpacking?
Perfect
can't I have unpacked? can't you have unpacked? can't he have unpacked? can't we have unpacked? can't you have unpacked? can't they have unpacked?
V-ing perfect
can't I have been unpacking? can't you have been unpacking? can't he have been unpacking? can't we have been unpacking? can't you have been unpacking? can't they have been unpacking?