Present
| I | curtail |
| You | curtail |
| She | curtails |
| We | curtail |
| They | curtail |
Past
| I | curtailed |
| You | curtailed |
| She | curtailed |
| We | curtailed |
| They | curtailed |
Perfect
| I | have | curtailed |
| You | have | curtailed |
| She | has | curtailed |
| We | have | curtailed |
| They | have | curtailed |
Future
| I | will | curtail |
| You | will | curtail |
| She | will | curtail |
| We | will | curtail |
| They | will | curtail |
Past Perfect
| I | had | curtailed |
| You | had | curtailed |
| She | had | curtailed |
| We | had | curtailed |
| They | had | curtailed |
Future Perfect
| I | will | have | curtailed |
| You | will | have | curtailed |
| She | will | have | curtailed |
| We | will | have | curtailed |
| They | will | have | curtailed |
Present - Conditional
| I | would | curtail |
| You | would | curtail |
| She | would | curtail |
| We | would | curtail |
| They | would | curtail |
Perfect - Conditional
| I | would | have | curtailed |
| You | would | have | curtailed |
| She | would | have | curtailed |
| We | would | have | curtailed |
| They | would | have | curtailed |