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