I must malfunction you must malfunction he must malfunction we must malfunction you must malfunction they must malfunction
V-ing form
I must be malfunctioning you must be malfunctioning he must be malfunctioning we must be malfunctioning you must be malfunctioning they must be malfunctioning
Perfect
I must have malfunctioned you must have malfunctioned he must have malfunctioned we must have malfunctioned you must have malfunctioned they must have malfunctioned
V-ing perfect
I must have been malfunctioning you must have been malfunctioning he must have been malfunctioning we must have been malfunctioning you must have been malfunctioning they must have been malfunctioning
Negation
Simple form
I must not malfunction you must not malfunction he must not malfunction we must not malfunction you must not malfunction they must not malfunction
V-ing form
I must not be malfunctioning you must not be malfunctioning he must not be malfunctioning we must not be malfunctioning you must not be malfunctioning they must not be malfunctioning
Perfect
I must not have malfunctioned you must not have malfunctioned he must not have malfunctioned we must not have malfunctioned you must not have malfunctioned they must not have malfunctioned
V-ing perfect
I must not have been malfunctioning you must not have been malfunctioning he must not have been malfunctioning we must not have been malfunctioning you must not have been malfunctioning they must not have been malfunctioning
Interrogative form
Simple form
must I malfunction? must you malfunction? must he malfunction? must we malfunction? must you malfunction? must they malfunction?
V-ing form
must I be malfunctioning? must you be malfunctioning? must he be malfunctioning? must we be malfunctioning? must you be malfunctioning? must they be malfunctioning?
Perfect
must I have malfunctioned? must you have malfunctioned? must he have malfunctioned? must we have malfunctioned? must you have malfunctioned? must they have malfunctioned?
V-ing perfect
must I have been malfunctioning? must you have been malfunctioning? must he have been malfunctioning? must we have been malfunctioning? must you have been malfunctioning? must they have been malfunctioning?
Interro-negative form
Simple form
must I not malfunction? must you not malfunction? must he not malfunction? must we not malfunction? must you not malfunction? must they not malfunction?
V-ing form
must I not be malfunctioning? must you not be malfunctioning? must he not be malfunctioning? must we not be malfunctioning? must you not be malfunctioning? must they not be malfunctioning?
Perfect
must I not have malfunctioned? must you not have malfunctioned? must he not have malfunctioned? must we not have malfunctioned? must you not have malfunctioned? must they not have malfunctioned?
V-ing perfect
must I not have been malfunctioning? must you not have been malfunctioning? must he not have been malfunctioning? must we not have been malfunctioning? must you not have been malfunctioning? must they not have been malfunctioning?