may trephine
Regular verb: trephine - trephined- trephined

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not trephine
you may not trephine
he may not trephine
we may not trephine
you may not trephine
they may not trephine 	I may not be trephining
you may not be trephining
he may not be trephining
we may not be trephining
you may not be trephining
they may not be trephining	I may not have trephined
you may not have trephined
he may not have trephined
we may not have trephined
you may not have trephined
they may not have trephined	I may not have been trephining
you may not have been trephining
he may not have been trephining
we may not have been trephining
you may not have been trephining
they may not have been trephining	

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

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