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 mustn't trepan you mustn't trepan he mustn't trepan we mustn't trepan you mustn't trepan they mustn't trepan	I mustn't be trepanning you mustn't be trepanning he mustn't be trepanning we mustn't be trepanning you mustn't be trepanning they mustn't be trepanning
Perfect	V-ing perfect
I mustn't have trepanned you mustn't have trepanned he mustn't have trepanned we mustn't have trepanned you mustn't have trepanned they mustn't have trepanned	I mustn't have been trepanning you mustn't have been trepanning he mustn't have been trepanning we mustn't have been trepanning you mustn't have been trepanning they mustn't 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
mustn't I trepan? mustn't you trepan? mustn't he trepan? mustn't we trepan? mustn't you trepan? mustn't they trepan?	mustn't I be trepanning? mustn't you be trepanning? mustn't he be trepanning? mustn't we be trepanning? mustn't you be trepanning? mustn't they be trepanning?
Perfect	V-ing perfect
mustn't I have trepanned? mustn't you have trepanned? mustn't he have trepanned? mustn't we have trepanned? mustn't you have trepanned? mustn't they have trepanned?	mustn't I have been trepanning? mustn't you have been trepanning? mustn't he have been trepanning? mustn't we have been trepanning? mustn't you have been trepanning? mustn't they have been trepanning?