I must surf you must surf she must surf we must surf you must surf they must surf
Forma con V-ing
I must be surfing you must be surfing she must be surfing we must be surfing you must be surfing they must be surfing
Perfecto
I must have surfed you must have surfed she must have surfed we must have surfed you must have surfed they must have surfed
Perfecto con V-ing
I must have been surfing you must have been surfing she must have been surfing we must have been surfing you must have been surfing they must have been surfing
Negación
Forma simple
I must not surf you must not surf she must not surf we must not surf you must not surf they must not surf
Forma con V-ing
I must not be surfing you must not be surfing she must not be surfing we must not be surfing you must not be surfing they must not be surfing
Perfecto
I must not have surfed you must not have surfed she must not have surfed we must not have surfed you must not have surfed they must not have surfed
Perfecto con V-ing
I must not have been surfing you must not have been surfing she must not have been surfing we must not have been surfing you must not have been surfing they must not have been surfing
Forma interrogativa
Forma simple
must I surf? must you surf? must she surf? must we surf? must you surf? must they surf?
Forma con V-ing
must I be surfing? must you be surfing? must she be surfing? must we be surfing? must you be surfing? must they be surfing?
Perfecto
must I have surfed? must you have surfed? must she have surfed? must we have surfed? must you have surfed? must they have surfed?
Perfecto con V-ing
must I have been surfing? must you have been surfing? must she have been surfing? must we have been surfing? must you have been surfing? must they have been surfing?
Forma interro-negativa
Forma simple
must I not surf? must you not surf? must she not surf? must we not surf? must you not surf? must they not surf?
Forma con V-ing
must I not be surfing? must you not be surfing? must she not be surfing? must we not be surfing? must you not be surfing? must they not be surfing?
Perfecto
must I not have surfed? must you not have surfed? must she not have surfed? must we not have surfed? must you not have surfed? must they not have surfed?
Perfecto con V-ing
must I not have been surfing? must you not have been surfing? must she not have been surfing? must we not have been surfing? must you not have been surfing? must they not have been surfing?