I must devitalize you must devitalize she must devitalize we must devitalize you must devitalize they must devitalize
V-ing form
I must be devitalizing you must be devitalizing she must be devitalizing we must be devitalizing you must be devitalizing they must be devitalizing
Perfect
I must have devitalized you must have devitalized she must have devitalized we must have devitalized you must have devitalized they must have devitalized
V-ing perfect
I must have been devitalizing you must have been devitalizing she must have been devitalizing we must have been devitalizing you must have been devitalizing they must have been devitalizing
Negation
Simple form
I must not devitalize you must not devitalize she must not devitalize we must not devitalize you must not devitalize they must not devitalize
V-ing form
I must not be devitalizing you must not be devitalizing she must not be devitalizing we must not be devitalizing you must not be devitalizing they must not be devitalizing
Perfect
I must not have devitalized you must not have devitalized she must not have devitalized we must not have devitalized you must not have devitalized they must not have devitalized
V-ing perfect
I must not have been devitalizing you must not have been devitalizing she must not have been devitalizing we must not have been devitalizing you must not have been devitalizing they must not have been devitalizing
Interrogative form
Simple form
must I devitalize? must you devitalize? must she devitalize? must we devitalize? must you devitalize? must they devitalize?
V-ing form
must I be devitalizing? must you be devitalizing? must she be devitalizing? must we be devitalizing? must you be devitalizing? must they be devitalizing?
Perfect
must I have devitalized? must you have devitalized? must she have devitalized? must we have devitalized? must you have devitalized? must they have devitalized?
V-ing perfect
must I have been devitalizing? must you have been devitalizing? must she have been devitalizing? must we have been devitalizing? must you have been devitalizing? must they have been devitalizing?
Interro-negative form
Simple form
must I not devitalize? must you not devitalize? must she not devitalize? must we not devitalize? must you not devitalize? must they not devitalize?
V-ing form
must I not be devitalizing? must you not be devitalizing? must she not be devitalizing? must we not be devitalizing? must you not be devitalizing? must they not be devitalizing?
Perfect
must I not have devitalized? must you not have devitalized? must she not have devitalized? must we not have devitalized? must you not have devitalized? must they not have devitalized?
V-ing perfect
must I not have been devitalizing? must you not have been devitalizing? must she not have been devitalizing? must we not have been devitalizing? must you not have been devitalizing? must they not have been devitalizing?