English verb conjugation
MUST PONG

Regular verb: pong - ponged - ponged

Affirmation

Simple form	V-ing form
I must pong you must pong he must pong we must pong you must pong they must pong	I must be ponging you must be ponging he must be ponging we must be ponging you must be ponging they must be ponging
Perfect	V-ing perfect
I must have ponged you must have ponged he must have ponged we must have ponged you must have ponged they must have ponged	I must have been ponging you must have been ponging he must have been ponging we must have been ponging you must have been ponging they must have been ponging

Negation

Simple form	V-ing form
I must not pong you must not pong he must not pong we must not pong you must not pong they must not pong	I must not be ponging you must not be ponging he must not be ponging we must not be ponging you must not be ponging they must not be ponging
Perfect	V-ing perfect
I must not have ponged you must not have ponged he must not have ponged we must not have ponged you must not have ponged they must not have ponged	I must not have been ponging you must not have been ponging he must not have been ponging we must not have been ponging you must not have been ponging they must not have been ponging

Interrogative form

Simple form	V-ing form
must I pong? must you pong? must he pong? must we pong? must you pong? must they pong?	must I be ponging? must you be ponging? must he be ponging? must we be ponging? must you be ponging? must they be ponging?
Perfect	V-ing perfect
must I have ponged? must you have ponged? must he have ponged? must we have ponged? must you have ponged? must they have ponged?	must I have been ponging? must you have been ponging? must he have been ponging? must we have been ponging? must you have been ponging? must they have been ponging?

Interro-negative form

Simple form	V-ing form
must I not pong? must you not pong? must he not pong? must we not pong? must you not pong? must they not pong?	must I not be ponging? must you not be ponging? must he not be ponging? must we not be ponging? must you not be ponging? must they not be ponging?
Perfect	V-ing perfect
must I not have ponged? must you not have ponged? must he not have ponged? must we not have ponged? must you not have ponged? must they not have ponged?	must I not have been ponging? must you not have been ponging? must he not have been ponging? must we not have been ponging? must you not have been ponging? must they not have been ponging?