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 must not long you must not long he must not long we must not long you must not long they must not long	I must not be longing you must not be longing he must not be longing we must not be longing you must not be longing they must not be longing
Perfect	V-ing perfect
I must not have longed you must not have longed he must not have longed we must not have longed you must not have longed they must not have longed	I must not have been longing you must not have been longing he must not have been longing we must not have been longing you must not have been longing they must not 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
must I not long? must you not long? must he not long? must we not long? must you not long? must they not long?	must I not be longing? must you not be longing? must he not be longing? must we not be longing? must you not be longing? must they not be longing?
Perfect	V-ing perfect
must I not have longed? must you not have longed? must he not have longed? must we not have longed? must you not have longed? must they not have longed?	must I not have been longing? must you not have been longing? must he not have been longing? must we not have been longing? must you not have been longing? must they not have been longing?