English verb conjugation
MUST FROG

Regular verb: frog - froged - froged

Affirmation

Simple form	V-ing form
I must frog you must frog he must frog we must frog you must frog they must frog	I must be froging you must be froging he must be froging we must be froging you must be froging they must be froging
Perfect	V-ing perfect
I must have froged you must have froged he must have froged we must have froged you must have froged they must have froged	I must have been froging you must have been froging he must have been froging we must have been froging you must have been froging they must have been froging

Negation

Simple form	V-ing form
I must not frog you must not frog he must not frog we must not frog you must not frog they must not frog	I must not be froging you must not be froging he must not be froging we must not be froging you must not be froging they must not be froging
Perfect	V-ing perfect
I must not have froged you must not have froged he must not have froged we must not have froged you must not have froged they must not have froged	I must not have been froging you must not have been froging he must not have been froging we must not have been froging you must not have been froging they must not have been froging

Interrogative form

Simple form	V-ing form
must I frog? must you frog? must he frog? must we frog? must you frog? must they frog?	must I be froging? must you be froging? must he be froging? must we be froging? must you be froging? must they be froging?
Perfect	V-ing perfect
must I have froged? must you have froged? must he have froged? must we have froged? must you have froged? must they have froged?	must I have been froging? must you have been froging? must he have been froging? must we have been froging? must you have been froging? must they have been froging?

Interro-negative form

Simple form	V-ing form
must I not frog? must you not frog? must he not frog? must we not frog? must you not frog? must they not frog?	must I not be froging? must you not be froging? must he not be froging? must we not be froging? must you not be froging? must they not be froging?
Perfect	V-ing perfect
must I not have froged? must you not have froged? must he not have froged? must we not have froged? must you not have froged? must they not have froged?	must I not have been froging? must you not have been froging? must he not have been froging? must we not have been froging? must you not have been froging? must they not have been froging?