I must disappear you must disappear she must disappear we must disappear you must disappear they must disappear
V-ing form
I must be disappearing you must be disappearing she must be disappearing we must be disappearing you must be disappearing they must be disappearing
Perfect
I must have disappeared you must have disappeared she must have disappeared we must have disappeared you must have disappeared they must have disappeared
V-ing perfect
I must have been disappearing you must have been disappearing she must have been disappearing we must have been disappearing you must have been disappearing they must have been disappearing
Negation
Simple form
I must not disappear you must not disappear she must not disappear we must not disappear you must not disappear they must not disappear
V-ing form
I must not be disappearing you must not be disappearing she must not be disappearing we must not be disappearing you must not be disappearing they must not be disappearing
Perfect
I must not have disappeared you must not have disappeared she must not have disappeared we must not have disappeared you must not have disappeared they must not have disappeared
V-ing perfect
I must not have been disappearing you must not have been disappearing she must not have been disappearing we must not have been disappearing you must not have been disappearing they must not have been disappearing
Interrogative form
Simple form
must I disappear? must you disappear? must she disappear? must we disappear? must you disappear? must they disappear?
V-ing form
must I be disappearing? must you be disappearing? must she be disappearing? must we be disappearing? must you be disappearing? must they be disappearing?
Perfect
must I have disappeared? must you have disappeared? must she have disappeared? must we have disappeared? must you have disappeared? must they have disappeared?
V-ing perfect
must I have been disappearing? must you have been disappearing? must she have been disappearing? must we have been disappearing? must you have been disappearing? must they have been disappearing?
Interro-negative form
Simple form
must I not disappear? must you not disappear? must she not disappear? must we not disappear? must you not disappear? must they not disappear?
V-ing form
must I not be disappearing? must you not be disappearing? must she not be disappearing? must we not be disappearing? must you not be disappearing? must they not be disappearing?
Perfect
must I not have disappeared? must you not have disappeared? must she not have disappeared? must we not have disappeared? must you not have disappeared? must they not have disappeared?
V-ing perfect
must I not have been disappearing? must you not have been disappearing? must she not have been disappearing? must we not have been disappearing? must you not have been disappearing? must they not have been disappearing?