must surf
Regular verb: surf - surfed- surfed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must surf
you must surf
she must surf
we must surf
you must surf
they must surf 	I must be surfing
you must be surfing
she must be surfing
we must be surfing
you must be surfing
they must be surfing	I must have surfed
you must have surfed
she 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
she 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
she 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
she 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
she 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
she 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 she surf?
must we surf?
must you surf?
must they surf? 	must I be surfing?
must you be surfing?
must she be surfing?
must we be surfing?
must you be surfing?
must they be surfing? 	must I have surfed?
must you have surfed?
must she 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 she 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 she 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 she 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 she 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 she have been surfing?
mustn't we have been surfing?
mustn't you have been surfing?
mustn't they have been surfing?