English verb conjugation
MUST TREPAN

Regular verb: trepan - trepanned - trepanned

Affirmation

Simple form	V-ing form
I must trepan you must trepan he must trepan we must trepan you must trepan they must trepan	I must be trepanning you must be trepanning he must be trepanning we must be trepanning you must be trepanning they must be trepanning
Perfect	V-ing perfect
I must have trepanned you must have trepanned he must have trepanned we must have trepanned you must have trepanned they must have trepanned	I must have been trepanning you must have been trepanning he must have been trepanning we must have been trepanning you must have been trepanning they must have been trepanning

Negation

Simple form	V-ing form
I must not trepan you must not trepan he must not trepan we must not trepan you must not trepan they must not trepan	I must not be trepanning you must not be trepanning he must not be trepanning we must not be trepanning you must not be trepanning they must not be trepanning
Perfect	V-ing perfect
I must not have trepanned you must not have trepanned he must not have trepanned we must not have trepanned you must not have trepanned they must not have trepanned	I must not have been trepanning you must not have been trepanning he must not have been trepanning we must not have been trepanning you must not have been trepanning they must not have been trepanning

Interrogative form

Simple form	V-ing form
must I trepan? must you trepan? must he trepan? must we trepan? must you trepan? must they trepan?	must I be trepanning? must you be trepanning? must he be trepanning? must we be trepanning? must you be trepanning? must they be trepanning?
Perfect	V-ing perfect
must I have trepanned? must you have trepanned? must he have trepanned? must we have trepanned? must you have trepanned? must they have trepanned?	must I have been trepanning? must you have been trepanning? must he have been trepanning? must we have been trepanning? must you have been trepanning? must they have been trepanning?

Interro-negative form

Simple form	V-ing form
must I not trepan? must you not trepan? must he not trepan? must we not trepan? must you not trepan? must they not trepan?	must I not be trepanning? must you not be trepanning? must he not be trepanning? must we not be trepanning? must you not be trepanning? must they not be trepanning?
Perfect	V-ing perfect
must I not have trepanned? must you not have trepanned? must he not have trepanned? must we not have trepanned? must you not have trepanned? must they not have trepanned?	must I not have been trepanning? must you not have been trepanning? must he not have been trepanning? must we not have been trepanning? must you not have been trepanning? must they not have been trepanning?