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