can trephine
Regular verb: trephine - trephined- trephined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can trephine
you can trephine
he can trephine
we can trephine
you can trephine
they can trephine 	I can be trephining
you can be trephining
he can be trephining
we can be trephining
you can be trephining
they can be trephining	I can have trephined
you can have trephined
he can have trephined
we can have trephined
you can have trephined
they can have trephined	I can have been trephining
you can have been trephining
he can have been trephining
we can have been trephining
you can have been trephining
they can have been trephining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't trephine
you can't trephine
he can't trephine
we can't trephine
you can't trephine
they can't trephine 	I can't be trephining
you can't be trephining
he can't be trephining
we can't be trephining
you can't be trephining
they can't be trephining	I can't have trephined
you can't have trephined
he can't have trephined
we can't have trephined
you can't have trephined
they can't have trephined	I can't have been trephining
you can't have been trephining
he can't have been trephining
we can't have been trephining
you can't have been trephining
they can't have been trephining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I trephine?
can you trephine?
can he trephine?
can we trephine?
can you trephine?
can they trephine? 	can I be trephining?
can you be trephining?
can he be trephining?
can we be trephining?
can you be trephining?
can they be trephining? 	can I have trephined?
can you have trephined?
can he have trephined?
can we have trephined?
can you have trephined?
can they have trephined? 	can I have been trephining?
can you have been trephining?
can he have been trephining?
can we have been trephining?
can you have been trephining?
can they have been trephining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I trephine?
can't you trephine?
can't he trephine?
can't we trephine?
can't you trephine?
can't they trephine? 	can't I be trephining?
can't you be trephining?
can't he be trephining?
can't we be trephining?
can't you be trephining?
can't they be trephining? 	can't I have trephined?
can't you have trephined?
can't he have trephined?
can't we have trephined?
can't you have trephined?
can't they have trephined? 	can't I have been trephining?
can't you have been trephining?
can't he have been trephining?
can't we have been trephining?
can't you have been trephining?
can't they have been trephining?