I can kill you can kill he can kill we can kill you can kill they can kill
V-ing form
I can be killing you can be killing he can be killing we can be killing you can be killing they can be killing
Perfect
I can have killed you can have killed he can have killed we can have killed you can have killed they can have killed
V-ing perfect
I can have been killing you can have been killing he can have been killing we can have been killing you can have been killing they can have been killing
Negation
Simple form
I cannot kill you cannot kill he cannot kill we cannot kill you cannot kill they cannot kill
V-ing form
I cannot be killing you cannot be killing he cannot be killing we cannot be killing you cannot be killing they cannot be killing
Perfect
I cannot have killed you cannot have killed he cannot have killed we cannot have killed you cannot have killed they cannot have killed
V-ing perfect
I cannot have been killing you cannot have been killing he cannot have been killing we cannot have been killing you cannot have been killing they cannot have been killing
Interrogative form
Simple form
can I kill? can you kill? can he kill? can we kill? can you kill? can they kill?
V-ing form
can I be killing? can you be killing? can he be killing? can we be killing? can you be killing? can they be killing?
Perfect
can I have killed? can you have killed? can he have killed? can we have killed? can you have killed? can they have killed?
V-ing perfect
can I have been killing? can you have been killing? can he have been killing? can we have been killing? can you have been killing? can they have been killing?
Interro-negative form
Simple form
can I not kill? can you not kill? can he not kill? can we not kill? can you not kill? can they not kill?
V-ing form
can I not be killing? can you not be killing? can he not be killing? can we not be killing? can you not be killing? can they not be killing?
Perfect
can I not have killed? can you not have killed? can he not have killed? can we not have killed? can you not have killed? can they not have killed?
V-ing perfect
can I not have been killing? can you not have been killing? can he not have been killing? can we not have been killing? can you not have been killing? can they not have been killing?