Present
| I | warn |
| You | warn |
| She | warns |
| We | warn |
| They | warn |
Past
| I | warned |
| You | warned |
| She | warned |
| We | warned |
| They | warned |
Perfect
| I | have | warned |
| You | have | warned |
| She | has | warned |
| We | have | warned |
| They | have | warned |
Future
| I | will | warn |
| You | will | warn |
| She | will | warn |
| We | will | warn |
| They | will | warn |
Past Perfect
| I | had | warned |
| You | had | warned |
| She | had | warned |
| We | had | warned |
| They | had | warned |
Future Perfect
| I | will | have | warned |
| You | will | have | warned |
| She | will | have | warned |
| We | will | have | warned |
| They | will | have | warned |
Present - Conditional
| I | would | warn |
| You | would | warn |
| She | would | warn |
| We | would | warn |
| They | would | warn |
Perfect - Conditional
| I | would | have | warned |
| You | would | have | warned |
| She | would | have | warned |
| We | would | have | warned |
| They | would | have | warned |