I can hack you can hack he can hack we can hack you can hack they can hack
V-ing form
I can be hacking you can be hacking he can be hacking we can be hacking you can be hacking they can be hacking
Perfect
I can have hacked you can have hacked he can have hacked we can have hacked you can have hacked they can have hacked
V-ing perfect
I can have been hacking you can have been hacking he can have been hacking we can have been hacking you can have been hacking they can have been hacking
Negation
Simple form
I can't hack you can't hack he can't hack we can't hack you can't hack they can't hack
V-ing form
I can't be hacking you can't be hacking he can't be hacking we can't be hacking you can't be hacking they can't be hacking
Perfect
I can't have hacked you can't have hacked he can't have hacked we can't have hacked you can't have hacked they can't have hacked
V-ing perfect
I can't have been hacking you can't have been hacking he can't have been hacking we can't have been hacking you can't have been hacking they can't have been hacking
Interrogative form
Simple form
can I hack? can you hack? can he hack? can we hack? can you hack? can they hack?
V-ing form
can I be hacking? can you be hacking? can he be hacking? can we be hacking? can you be hacking? can they be hacking?
Perfect
can I have hacked? can you have hacked? can he have hacked? can we have hacked? can you have hacked? can they have hacked?
V-ing perfect
can I have been hacking? can you have been hacking? can he have been hacking? can we have been hacking? can you have been hacking? can they have been hacking?
Interro-negative form
Simple form
can't I hack? can't you hack? can't he hack? can't we hack? can't you hack? can't they hack?
V-ing form
can't I be hacking? can't you be hacking? can't he be hacking? can't we be hacking? can't you be hacking? can't they be hacking?
Perfect
can't I have hacked? can't you have hacked? can't he have hacked? can't we have hacked? can't you have hacked? can't they have hacked?
V-ing perfect
can't I have been hacking? can't you have been hacking? can't he have been hacking? can't we have been hacking? can't you have been hacking? can't they have been hacking?