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 mayn't trephine
you mayn't trephine
he mayn't trephine
we mayn't trephine
you mayn't trephine
they mayn't trephine 	I mayn't be trephining
you mayn't be trephining
he mayn't be trephining
we mayn't be trephining
you mayn't be trephining
they mayn't be trephining	I mayn't have trephined
you mayn't have trephined
he mayn't have trephined
we mayn't have trephined
you mayn't have trephined
they mayn't have trephined	I mayn't have been trephining
you mayn't have been trephining
he mayn't have been trephining
we mayn't have been trephining
you mayn't have been trephining
they mayn't 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 	
mayn't I trephine?
mayn't you trephine?
mayn't he trephine?
mayn't we trephine?
mayn't you trephine?
mayn't they trephine? 	mayn't I be trephining?
mayn't you be trephining?
mayn't he be trephining?
mayn't we be trephining?
mayn't you be trephining?
mayn't they be trephining? 	mayn't I have trephined?
mayn't you have trephined?
mayn't he have trephined?
mayn't we have trephined?
mayn't you have trephined?
mayn't they have trephined? 	mayn't I have been trephining?
mayn't you have been trephining?
mayn't he have been trephining?
mayn't we have been trephining?
mayn't you have been trephining?
mayn't they have been trephining?