English verb conjugation
CAN TREPAN

Regular verb: trepan - trepanned - trepanned

Affirmation

Simple form	V-ing form
I can trepan you can trepan she can trepan we can trepan you can trepan they can trepan	I can be trepanning you can be trepanning she 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 she 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 she 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 can't trepan you can't trepan she can't trepan we can't trepan you can't trepan they can't trepan	I can't be trepanning you can't be trepanning she can't be trepanning we can't be trepanning you can't be trepanning they can't be trepanning
Perfect	V-ing perfect
I can't have trepanned you can't have trepanned she can't have trepanned we can't have trepanned you can't have trepanned they can't have trepanned	I can't have been trepanning you can't have been trepanning she can't have been trepanning we can't have been trepanning you can't have been trepanning they can't have been trepanning

Interrogative form

Simple form	V-ing form
can I trepan? can you trepan? can she trepan? can we trepan? can you trepan? can they trepan?	can I be trepanning? can you be trepanning? can she 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 she 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 she 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't I trepan? can't you trepan? can't she trepan? can't we trepan? can't you trepan? can't they trepan?	can't I be trepanning? can't you be trepanning? can't she be trepanning? can't we be trepanning? can't you be trepanning? can't they be trepanning?
Perfect	V-ing perfect
can't I have trepanned? can't you have trepanned? can't she have trepanned? can't we have trepanned? can't you have trepanned? can't they have trepanned?	can't I have been trepanning? can't you have been trepanning? can't she have been trepanning? can't we have been trepanning? can't you have been trepanning? can't they have been trepanning?