Present
| I | harden |
| You | harden |
| She | hardens |
| We | harden |
| They | harden |
Past
| I | hardened |
| You | hardened |
| She | hardened |
| We | hardened |
| They | hardened |
Perfect
| I | have | hardened |
| You | have | hardened |
| She | has | hardened |
| We | have | hardened |
| They | have | hardened |
Future
| I | will | harden |
| You | will | harden |
| She | will | harden |
| We | will | harden |
| They | will | harden |
Past Perfect
| I | had | hardened |
| You | had | hardened |
| She | had | hardened |
| We | had | hardened |
| They | had | hardened |
Future Perfect
| I | will | have | hardened |
| You | will | have | hardened |
| She | will | have | hardened |
| We | will | have | hardened |
| They | will | have | hardened |
Present - Conditional
| I | would | harden |
| You | would | harden |
| She | would | harden |
| We | would | harden |
| They | would | harden |
Perfect - Conditional
| I | would | have | hardened |
| You | would | have | hardened |
| She | would | have | hardened |
| We | would | have | hardened |
| They | would | have | hardened |