Present
| I | flatten |
| You | flatten |
| She | flattens |
| We | flatten |
| They | flatten |
Past
| I | flattened |
| You | flattened |
| She | flattened |
| We | flattened |
| They | flattened |
Perfect
| I | have | flattened |
| You | have | flattened |
| She | has | flattened |
| We | have | flattened |
| They | have | flattened |
Future
| I | will | flatten |
| You | will | flatten |
| She | will | flatten |
| We | will | flatten |
| They | will | flatten |
Past Perfect
| I | had | flattened |
| You | had | flattened |
| She | had | flattened |
| We | had | flattened |
| They | had | flattened |
Future Perfect
| I | will | have | flattened |
| You | will | have | flattened |
| She | will | have | flattened |
| We | will | have | flattened |
| They | will | have | flattened |
Present - Conditional
| I | would | flatten |
| You | would | flatten |
| She | would | flatten |
| We | would | flatten |
| They | would | flatten |
Perfect - Conditional
| I | would | have | flattened |
| You | would | have | flattened |
| She | would | have | flattened |
| We | would | have | flattened |
| They | would | have | flattened |