English verb conjugation
MUST SURF

Regular verb: surf - surfed - surfed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?