English verb conjugation
MUST LONG

Regular verb: long - longed - longed

Affirmation

Simple form	V-ing form
I must long you must long he must long we must long you must long they must long	I must be longing you must be longing he must be longing we must be longing you must be longing they must be longing
Perfect	V-ing perfect
I must have longed you must have longed he must have longed we must have longed you must have longed they must have longed	I must have been longing you must have been longing he must have been longing we must have been longing you must have been longing they must have been longing

Negation

Simple form	V-ing form
I mustn't long you mustn't long he mustn't long we mustn't long you mustn't long they mustn't long	I mustn't be longing you mustn't be longing he mustn't be longing we mustn't be longing you mustn't be longing they mustn't be longing
Perfect	V-ing perfect
I mustn't have longed you mustn't have longed he mustn't have longed we mustn't have longed you mustn't have longed they mustn't have longed	I mustn't have been longing you mustn't have been longing he mustn't have been longing we mustn't have been longing you mustn't have been longing they mustn't have been longing

Interrogative form

Simple form	V-ing form
must I long? must you long? must he long? must we long? must you long? must they long?	must I be longing? must you be longing? must he be longing? must we be longing? must you be longing? must they be longing?
Perfect	V-ing perfect
must I have longed? must you have longed? must he have longed? must we have longed? must you have longed? must they have longed?	must I have been longing? must you have been longing? must he have been longing? must we have been longing? must you have been longing? must they have been longing?

Interro-negative form

Simple form	V-ing form
mustn't I long? mustn't you long? mustn't he long? mustn't we long? mustn't you long? mustn't they long?	mustn't I be longing? mustn't you be longing? mustn't he be longing? mustn't we be longing? mustn't you be longing? mustn't they be longing?
Perfect	V-ing perfect
mustn't I have longed? mustn't you have longed? mustn't he have longed? mustn't we have longed? mustn't you have longed? mustn't they have longed?	mustn't I have been longing? mustn't you have been longing? mustn't he have been longing? mustn't we have been longing? mustn't you have been longing? mustn't they have been longing?