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