I must frog you must frog he must frog we must frog you must frog they must frog
Forma con V-ing
I must be froging you must be froging he must be froging we must be froging you must be froging they must be froging
Perfecto
I must have froged you must have froged he must have froged we must have froged you must have froged they must have froged
Perfecto con V-ing
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
Negación
Forma simple
I must not frog you must not frog he must not frog we must not frog you must not frog they must not frog
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
Forma interrogativa
Forma simple
must I frog? must you frog? must he frog? must we frog? must you frog? must they frog?
Forma con V-ing
must I be froging? must you be froging? must he be froging? must we be froging? must you be froging? must they be froging?
Perfecto
must I have froged? must you have froged? must he have froged? must we have froged? must you have froged? must they have froged?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
must I not frog? must you not frog? must he not frog? must we not frog? must you not frog? must they not frog?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?