English verb conjugation
CAN TREPAN

Regular verb: trepan - trepanned - trepanned

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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