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