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