can trepan
Regular verb: trepan - trepanned- trepanned

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