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 must not surf
you must not surf
he must not surf
we must not surf
you must not surf
they must not surf 	I must not be surfing
you must not be surfing
he must not be surfing
we must not be surfing
you must not be surfing
they must not be surfing	I must not have surfed
you must not have surfed
he must not have surfed
we must not have surfed
you must not have surfed
they must not have surfed	I must not have been surfing
you must not have been surfing
he must not have been surfing
we must not have been surfing
you must not have been surfing
they must not 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 	
must I not surf?
must you not surf?
must he not surf?
must we not surf?
must you not surf?
must they not surf? 	must I not be surfing?
must you not be surfing?
must he not be surfing?
must we not be surfing?
must you not be surfing?
must they not be surfing? 	must I not have surfed?
must you not have surfed?
must he not have surfed?
must we not have surfed?
must you not have surfed?
must they not have surfed? 	must I not have been surfing?
must you not have been surfing?
must he not have been surfing?
must we not have been surfing?
must you not have been surfing?
must they not have been surfing?