Present
| I | weaken |
| You | weaken |
| She | weakens |
| We | weaken |
| They | weaken |
Past
| I | weakened |
| You | weakened |
| She | weakened |
| We | weakened |
| They | weakened |
Perfect
| I | have | weakened |
| You | have | weakened |
| She | has | weakened |
| We | have | weakened |
| They | have | weakened |
Future
| I | will | weaken |
| You | will | weaken |
| She | will | weaken |
| We | will | weaken |
| They | will | weaken |
Past Perfect
| I | had | weakened |
| You | had | weakened |
| She | had | weakened |
| We | had | weakened |
| They | had | weakened |
Future Perfect
| I | will | have | weakened |
| You | will | have | weakened |
| She | will | have | weakened |
| We | will | have | weakened |
| They | will | have | weakened |
Present - Conditional
| I | would | weaken |
| You | would | weaken |
| She | would | weaken |
| We | would | weaken |
| They | would | weaken |
Perfect - Conditional
| I | would | have | weakened |
| You | would | have | weakened |
| She | would | have | weakened |
| We | would | have | weakened |
| They | would | have | weakened |