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