don't I trephine? don't you trephine? doesn't he trephine? don't we trephine? don't you trephine? don't they trephine?
Present continuous
am I not trephining? aren't you trephining? isn't he trephining? aren't we trephining? aren't you trephining? aren't they trephining?
Preterite
didn't I trephine? didn't you trephine? didn't he trephine? didn't we trephine? didn't you trephine? didn't they trephine?
Preterite continuous
wasn't I trephining? weren't you trephining? wasn't he trephining? weren't we trephining? weren't you trephining? weren't they trephining?
Present perfect
haven't I trephined? haven't you trephined? hasn't he trephined? haven't we trephined? haven't you trephined? haven't they trephined?
Present perfect continuous
haven't I been trephining? haven't you been trephining? hasn't he been trephining? haven't we been trephining? haven't you been trephining? haven't they been trephining?
Pluperfect
hadn't I trephined? hadn't you trephined? hadn't he trephined? hadn't we trephined? hadn't you trephined? hadn't they trephined?
Pluperfect continuous
hadn't I been trephining? hadn't you been trephining? hadn't he been trephining? hadn't we been trephining? hadn't you been trephining? hadn't they been trephining?
Future
won't I trephine? won't you trephine? won't he trephine? won't we trephine? won't you trephine? won't they trephine?
Future continuous
won't I be trephining? won't you be trephining? won't he be trephining? won't we be trephining? won't you be trephining? won't they be trephining?
Future perfect
won't I have trephined? won't you have trephined? won't he have trephined? won't we have trephined? won't you have trephined? won't they have trephined?
Future perfect continuous
won't I have been trephining? won't you have been trephining? won't he have been trephining? won't we have been trephining? won't you have been trephining? won't they have been trephining?
Conditional
Present
wouldn't I trephine? wouldn't you trephine? wouldn't he trephine? wouldn't we trephine? wouldn't you trephine? wouldn't they trephine?
Present continuous
wouldn't I be trephining? wouldn't you be trephining? wouldn't he be trephining? wouldn't we be trephining? wouldn't you be trephining? wouldn't they be trephining?
Past
wouldn't I have trephined? wouldn't you have trephined? wouldn't he have trephined? wouldn't we have trephined? wouldn't you have trephined? wouldn't they have trephined?
Past continuous
wouldn't I have been trephining? wouldn't you have been trephining? wouldn't he have been trephining? wouldn't we have been trephining? wouldn't you have been trephining? wouldn't they have been trephining?