I must disengage you must disengage he must disengage we must disengage you must disengage they must disengage
V-ing form
I must be disengaging you must be disengaging he must be disengaging we must be disengaging you must be disengaging they must be disengaging
Perfect
I must have disengaged you must have disengaged he must have disengaged we must have disengaged you must have disengaged they must have disengaged
V-ing perfect
I must have been disengaging you must have been disengaging he must have been disengaging we must have been disengaging you must have been disengaging they must have been disengaging
Negation
Simple form
I must not disengage you must not disengage he must not disengage we must not disengage you must not disengage they must not disengage
V-ing form
I must not be disengaging you must not be disengaging he must not be disengaging we must not be disengaging you must not be disengaging they must not be disengaging
Perfect
I must not have disengaged you must not have disengaged he must not have disengaged we must not have disengaged you must not have disengaged they must not have disengaged
V-ing perfect
I must not have been disengaging you must not have been disengaging he must not have been disengaging we must not have been disengaging you must not have been disengaging they must not have been disengaging
Interrogative form
Simple form
must I disengage? must you disengage? must he disengage? must we disengage? must you disengage? must they disengage?
V-ing form
must I be disengaging? must you be disengaging? must he be disengaging? must we be disengaging? must you be disengaging? must they be disengaging?
Perfect
must I have disengaged? must you have disengaged? must he have disengaged? must we have disengaged? must you have disengaged? must they have disengaged?
V-ing perfect
must I have been disengaging? must you have been disengaging? must he have been disengaging? must we have been disengaging? must you have been disengaging? must they have been disengaging?
Interro-negative form
Simple form
must I not disengage? must you not disengage? must he not disengage? must we not disengage? must you not disengage? must they not disengage?
V-ing form
must I not be disengaging? must you not be disengaging? must he not be disengaging? must we not be disengaging? must you not be disengaging? must they not be disengaging?
Perfect
must I not have disengaged? must you not have disengaged? must he not have disengaged? must we not have disengaged? must you not have disengaged? must they not have disengaged?
V-ing perfect
must I not have been disengaging? must you not have been disengaging? must he not have been disengaging? must we not have been disengaging? must you not have been disengaging? must they not have been disengaging?