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