Present
| I | lessen |
| You | lessen |
| She | lessens |
| We | lessen |
| They | lessen |
Past
| I | lessened |
| You | lessened |
| She | lessened |
| We | lessened |
| They | lessened |
Perfect
| I | have | lessened |
| You | have | lessened |
| She | has | lessened |
| We | have | lessened |
| They | have | lessened |
Future
| I | will | lessen |
| You | will | lessen |
| She | will | lessen |
| We | will | lessen |
| They | will | lessen |
Past Perfect
| I | had | lessened |
| You | had | lessened |
| She | had | lessened |
| We | had | lessened |
| They | had | lessened |
Future Perfect
| I | will | have | lessened |
| You | will | have | lessened |
| She | will | have | lessened |
| We | will | have | lessened |
| They | will | have | lessened |
Present - Conditional
| I | would | lessen |
| You | would | lessen |
| She | would | lessen |
| We | would | lessen |
| They | would | lessen |
Perfect - Conditional
| I | would | have | lessened |
| You | would | have | lessened |
| She | would | have | lessened |
| We | would | have | lessened |
| They | would | have | lessened |