I must barb you must barb he must barb we must barb you must barb they must barb
Forma con V-ing
I must be barbing you must be barbing he must be barbing we must be barbing you must be barbing they must be barbing
Perfecto
I must have barbed you must have barbed he must have barbed we must have barbed you must have barbed they must have barbed
Perfecto con V-ing
I must have been barbing you must have been barbing he must have been barbing we must have been barbing you must have been barbing they must have been barbing
Negación
Forma simple
I must not barb you must not barb he must not barb we must not barb you must not barb they must not barb
Forma con V-ing
I must not be barbing you must not be barbing he must not be barbing we must not be barbing you must not be barbing they must not be barbing
Perfecto
I must not have barbed you must not have barbed he must not have barbed we must not have barbed you must not have barbed they must not have barbed
Perfecto con V-ing
I must not have been barbing you must not have been barbing he must not have been barbing we must not have been barbing you must not have been barbing they must not have been barbing
Forma interrogativa
Forma simple
must I barb? must you barb? must he barb? must we barb? must you barb? must they barb?
Forma con V-ing
must I be barbing? must you be barbing? must he be barbing? must we be barbing? must you be barbing? must they be barbing?
Perfecto
must I have barbed? must you have barbed? must he have barbed? must we have barbed? must you have barbed? must they have barbed?
Perfecto con V-ing
must I have been barbing? must you have been barbing? must he have been barbing? must we have been barbing? must you have been barbing? must they have been barbing?
Forma interro-negativa
Forma simple
must I not barb? must you not barb? must he not barb? must we not barb? must you not barb? must they not barb?
Forma con V-ing
must I not be barbing? must you not be barbing? must he not be barbing? must we not be barbing? must you not be barbing? must they not be barbing?
Perfecto
must I not have barbed? must you not have barbed? must he not have barbed? must we not have barbed? must you not have barbed? must they not have barbed?
Perfecto con V-ing
must I not have been barbing? must you not have been barbing? must he not have been barbing? must we not have been barbing? must you not have been barbing? must they not have been barbing?