I must bark you must bark she must bark we must bark you must bark they must bark
Forma con V-ing
I must be barking you must be barking she must be barking we must be barking you must be barking they must be barking
Perfecto
I must have barked you must have barked she must have barked we must have barked you must have barked they must have barked
Perfecto con V-ing
I must have been barking you must have been barking she must have been barking we must have been barking you must have been barking they must have been barking
Negación
Forma simple
I must not bark you must not bark she must not bark we must not bark you must not bark they must not bark
Forma con V-ing
I must not be barking you must not be barking she must not be barking we must not be barking you must not be barking they must not be barking
Perfecto
I must not have barked you must not have barked she must not have barked we must not have barked you must not have barked they must not have barked
Perfecto con V-ing
I must not have been barking you must not have been barking she must not have been barking we must not have been barking you must not have been barking they must not have been barking
Forma interrogativa
Forma simple
must I bark? must you bark? must she bark? must we bark? must you bark? must they bark?
Forma con V-ing
must I be barking? must you be barking? must she be barking? must we be barking? must you be barking? must they be barking?
Perfecto
must I have barked? must you have barked? must she have barked? must we have barked? must you have barked? must they have barked?
Perfecto con V-ing
must I have been barking? must you have been barking? must she have been barking? must we have been barking? must you have been barking? must they have been barking?
Forma interro-negativa
Forma simple
must I not bark? must you not bark? must she not bark? must we not bark? must you not bark? must they not bark?
Forma con V-ing
must I not be barking? must you not be barking? must she not be barking? must we not be barking? must you not be barking? must they not be barking?
Perfecto
must I not have barked? must you not have barked? must she not have barked? must we not have barked? must you not have barked? must they not have barked?
Perfecto con V-ing
must I not have been barking? must you not have been barking? must she not have been barking? must we not have been barking? must you not have been barking? must they not have been barking?