must surf
Regular verb: surf - surfed- surfed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must surf
you must surf
he must surf
we must surf
you must surf
they must surf 	I must be surfing
you must be surfing
he must be surfing
we must be surfing
you must be surfing
they must be surfing	I must have surfed
you must have surfed
he must have surfed
we must have surfed
you must have surfed
they must have surfed	I must have been surfing
you must have been surfing
he must have been surfing
we must have been surfing
you must have been surfing
they must have been surfing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't surf
you mustn't surf
he mustn't surf
we mustn't surf
you mustn't surf
they mustn't surf 	I mustn't be surfing
you mustn't be surfing
he mustn't be surfing
we mustn't be surfing
you mustn't be surfing
they mustn't be surfing	I mustn't have surfed
you mustn't have surfed
he mustn't have surfed
we mustn't have surfed
you mustn't have surfed
they mustn't have surfed	I mustn't have been surfing
you mustn't have been surfing
he mustn't have been surfing
we mustn't have been surfing
you mustn't have been surfing
they mustn't have been surfing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I surf?
must you surf?
must he surf?
must we surf?
must you surf?
must they surf? 	must I be surfing?
must you be surfing?
must he be surfing?
must we be surfing?
must you be surfing?
must they be surfing? 	must I have surfed?
must you have surfed?
must he have surfed?
must we have surfed?
must you have surfed?
must they have surfed? 	must I have been surfing?
must you have been surfing?
must he have been surfing?
must we have been surfing?
must you have been surfing?
must they have been surfing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I surf?
mustn't you surf?
mustn't he surf?
mustn't we surf?
mustn't you surf?
mustn't they surf? 	mustn't I be surfing?
mustn't you be surfing?
mustn't he be surfing?
mustn't we be surfing?
mustn't you be surfing?
mustn't they be surfing? 	mustn't I have surfed?
mustn't you have surfed?
mustn't he have surfed?
mustn't we have surfed?
mustn't you have surfed?
mustn't they have surfed? 	mustn't I have been surfing?
mustn't you have been surfing?
mustn't he have been surfing?
mustn't we have been surfing?
mustn't you have been surfing?
mustn't they have been surfing?