English verb conjugation
MUST DISAPPEAR

Regular verb: disappear - disappeared - disappeared

Affirmation

Simple form	V-ing form
I must disappear you must disappear he must disappear we must disappear you must disappear they must disappear	I must be disappearing you must be disappearing he must be disappearing we must be disappearing you must be disappearing they must be disappearing
Perfect	V-ing perfect
I must have disappeared you must have disappeared he must have disappeared we must have disappeared you must have disappeared they must have disappeared	I must have been disappearing you must have been disappearing he must have been disappearing we must have been disappearing you must have been disappearing they must have been disappearing

Negation

Simple form	V-ing form
I must not disappear you must not disappear he must not disappear we must not disappear you must not disappear they must not disappear	I must not be disappearing you must not be disappearing he must not be disappearing we must not be disappearing you must not be disappearing they must not be disappearing
Perfect	V-ing perfect
I must not have disappeared you must not have disappeared he must not have disappeared we must not have disappeared you must not have disappeared they must not have disappeared	I must not have been disappearing you must not have been disappearing he 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	V-ing form
must I disappear? must you disappear? must he disappear? must we disappear? must you disappear? must they disappear?	must I be disappearing? must you be disappearing? must he be disappearing? must we be disappearing? must you be disappearing? must they be disappearing?
Perfect	V-ing perfect
must I have disappeared? must you have disappeared? must he have disappeared? must we have disappeared? must you have disappeared? must they have disappeared?	must I have been disappearing? must you have been disappearing? must he have been disappearing? must we have been disappearing? must you have been disappearing? must they have been disappearing?

Interro-negative form

Simple form	V-ing form
must I not disappear? must you not disappear? must he not disappear? must we not disappear? must you not disappear? must they not disappear?	must I not be disappearing? must you not be disappearing? must he not be disappearing? must we not be disappearing? must you not be disappearing? must they not be disappearing?
Perfect	V-ing perfect
must I not have disappeared? must you not have disappeared? must he not have disappeared? must we not have disappeared? must you not have disappeared? must they not have disappeared?	must I not have been disappearing? must you not have been disappearing? must he not have been disappearing? must we not have been disappearing? must you not have been disappearing? must they not have been disappearing?