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 mustn't surf you mustn't surf she mustn't surf we mustn't surf you mustn't surf they mustn't surf
Forma con V-ing
I mustn't be surfing you mustn't be surfing she mustn't be surfing we mustn't be surfing you mustn't be surfing they mustn't be surfing
Perfecto
I mustn't have surfed you mustn't have surfed she mustn't have surfed we mustn't have surfed you mustn't have surfed they mustn't have surfed
Perfecto con V-ing
I mustn't have been surfing you mustn't have been surfing she mustn't have been surfing we mustn't have been surfing you mustn't have been surfing they mustn't 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
mustn't I surf? mustn't you surf? mustn't she surf? mustn't we surf? mustn't you surf? mustn't they surf?
Forma con V-ing
mustn't I be surfing? mustn't you be surfing? mustn't she be surfing? mustn't we be surfing? mustn't you be surfing? mustn't they be surfing?
Perfecto
mustn't I have surfed? mustn't you have surfed? mustn't she have surfed? mustn't we have surfed? mustn't you have surfed? mustn't they have surfed?
Perfecto con V-ing
mustn't I have been surfing? mustn't you have been surfing? mustn't she have been surfing? mustn't we have been surfing? mustn't you have been surfing? mustn't they have been surfing?