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 cannot hack you cannot hack he cannot hack we cannot hack you cannot hack they cannot hack
V-ing form
I cannot be hacking you cannot be hacking he cannot be hacking we cannot be hacking you cannot be hacking they cannot be hacking
Perfect
I cannot have hacked you cannot have hacked he cannot have hacked we cannot have hacked you cannot have hacked they cannot have hacked
V-ing perfect
I cannot have been hacking you cannot have been hacking he cannot have been hacking we cannot have been hacking you cannot have been hacking they cannot 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 I not hack? can you not hack? can he not hack? can we not hack? can you not hack? can they not hack?
V-ing form
can I not be hacking? can you not be hacking? can he not be hacking? can we not be hacking? can you not be hacking? can they not be hacking?
Perfect
can I not have hacked? can you not have hacked? can he not have hacked? can we not have hacked? can you not have hacked? can they not have hacked?
V-ing perfect
can I not have been hacking? can you not have been hacking? can he not have been hacking? can we not have been hacking? can you not have been hacking? can they not have been hacking?