English verb conjugation
MUST PACK

Regular verb: pack - packed - packed

Affirmation

Simple form	V-ing form
I must pack you must pack he must pack we must pack you must pack they must pack	I must be packing you must be packing he must be packing we must be packing you must be packing they must be packing
Perfect	V-ing perfect
I must have packed you must have packed he must have packed we must have packed you must have packed they must have packed	I must have been packing you must have been packing he must have been packing we must have been packing you must have been packing they must have been packing

Negation

Simple form	V-ing form
I mustn't pack you mustn't pack he mustn't pack we mustn't pack you mustn't pack they mustn't pack	I mustn't be packing you mustn't be packing he mustn't be packing we mustn't be packing you mustn't be packing they mustn't be packing
Perfect	V-ing perfect
I mustn't have packed you mustn't have packed he mustn't have packed we mustn't have packed you mustn't have packed they mustn't have packed	I mustn't have been packing you mustn't have been packing he mustn't have been packing we mustn't have been packing you mustn't have been packing they mustn't have been packing

Interrogative form

Simple form	V-ing form
must I pack? must you pack? must he pack? must we pack? must you pack? must they pack?	must I be packing? must you be packing? must he be packing? must we be packing? must you be packing? must they be packing?
Perfect	V-ing perfect
must I have packed? must you have packed? must he have packed? must we have packed? must you have packed? must they have packed?	must I have been packing? must you have been packing? must he have been packing? must we have been packing? must you have been packing? must they have been packing?

Interro-negative form

Simple form	V-ing form
mustn't I pack? mustn't you pack? mustn't he pack? mustn't we pack? mustn't you pack? mustn't they pack?	mustn't I be packing? mustn't you be packing? mustn't he be packing? mustn't we be packing? mustn't you be packing? mustn't they be packing?
Perfect	V-ing perfect
mustn't I have packed? mustn't you have packed? mustn't he have packed? mustn't we have packed? mustn't you have packed? mustn't they have packed?	mustn't I have been packing? mustn't you have been packing? mustn't he have been packing? mustn't we have been packing? mustn't you have been packing? mustn't they have been packing?