I can pack you can pack he can pack we can pack you can pack they can pack
V-ing form
I can be packing you can be packing he can be packing we can be packing you can be packing they can be packing
Perfect
I can have packed you can have packed he can have packed we can have packed you can have packed they can have packed
V-ing perfect
I can have been packing you can have been packing he can have been packing we can have been packing you can have been packing they can have been packing
Negation
Simple form
I can't pack you can't pack he can't pack we can't pack you can't pack they can't pack
V-ing form
I can't be packing you can't be packing he can't be packing we can't be packing you can't be packing they can't be packing
Perfect
I can't have packed you can't have packed he can't have packed we can't have packed you can't have packed they can't have packed
V-ing perfect
I can't have been packing you can't have been packing he can't have been packing we can't have been packing you can't have been packing they can't have been packing
Interrogative form
Simple form
can I pack? can you pack? can he pack? can we pack? can you pack? can they pack?
V-ing form
can I be packing? can you be packing? can he be packing? can we be packing? can you be packing? can they be packing?
Perfect
can I have packed? can you have packed? can he have packed? can we have packed? can you have packed? can they have packed?
V-ing perfect
can I have been packing? can you have been packing? can he have been packing? can we have been packing? can you have been packing? can they have been packing?
Interro-negative form
Simple form
can't I pack? can't you pack? can't he pack? can't we pack? can't you pack? can't they pack?
V-ing form
can't I be packing? can't you be packing? can't he be packing? can't we be packing? can't you be packing? can't they be packing?
Perfect
can't I have packed? can't you have packed? can't he have packed? can't we have packed? can't you have packed? can't they have packed?
V-ing perfect
can't I have been packing? can't you have been packing? can't he have been packing? can't we have been packing? can't you have been packing? can't they have been packing?