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