I must sterilize you must sterilize he must sterilize we must sterilize you must sterilize they must sterilize
V-ing form
I must be sterilizing you must be sterilizing he must be sterilizing we must be sterilizing you must be sterilizing they must be sterilizing
Perfect
I must have sterilized you must have sterilized he must have sterilized we must have sterilized you must have sterilized they must have sterilized
V-ing perfect
I must have been sterilizing you must have been sterilizing he must have been sterilizing we must have been sterilizing you must have been sterilizing they must have been sterilizing
Negation
Simple form
I must not sterilize you must not sterilize he must not sterilize we must not sterilize you must not sterilize they must not sterilize
V-ing form
I must not be sterilizing you must not be sterilizing he must not be sterilizing we must not be sterilizing you must not be sterilizing they must not be sterilizing
Perfect
I must not have sterilized you must not have sterilized he must not have sterilized we must not have sterilized you must not have sterilized they must not have sterilized
V-ing perfect
I must not have been sterilizing you must not have been sterilizing he must not have been sterilizing we must not have been sterilizing you must not have been sterilizing they must not have been sterilizing
Interrogative form
Simple form
must I sterilize? must you sterilize? must he sterilize? must we sterilize? must you sterilize? must they sterilize?
V-ing form
must I be sterilizing? must you be sterilizing? must he be sterilizing? must we be sterilizing? must you be sterilizing? must they be sterilizing?
Perfect
must I have sterilized? must you have sterilized? must he have sterilized? must we have sterilized? must you have sterilized? must they have sterilized?
V-ing perfect
must I have been sterilizing? must you have been sterilizing? must he have been sterilizing? must we have been sterilizing? must you have been sterilizing? must they have been sterilizing?
Interro-negative form
Simple form
must I not sterilize? must you not sterilize? must he not sterilize? must we not sterilize? must you not sterilize? must they not sterilize?
V-ing form
must I not be sterilizing? must you not be sterilizing? must he not be sterilizing? must we not be sterilizing? must you not be sterilizing? must they not be sterilizing?
Perfect
must I not have sterilized? must you not have sterilized? must he not have sterilized? must we not have sterilized? must you not have sterilized? must they not have sterilized?
V-ing perfect
must I not have been sterilizing? must you not have been sterilizing? must he not have been sterilizing? must we not have been sterilizing? must you not have been sterilizing? must they not have been sterilizing?