Present
| I | stumble |
| You | stumble |
| She | stumbles |
| We | stumble |
| They | stumble |
Past
| I | stumbled |
| You | stumbled |
| She | stumbled |
| We | stumbled |
| They | stumbled |
Perfect
| I | have | stumbled |
| You | have | stumbled |
| She | has | stumbled |
| We | have | stumbled |
| They | have | stumbled |
Future
| I | will | stumble |
| You | will | stumble |
| She | will | stumble |
| We | will | stumble |
| They | will | stumble |
Past Perfect
| I | had | stumbled |
| You | had | stumbled |
| She | had | stumbled |
| We | had | stumbled |
| They | had | stumbled |
Future Perfect
| I | will | have | stumbled |
| You | will | have | stumbled |
| She | will | have | stumbled |
| We | will | have | stumbled |
| They | will | have | stumbled |
Present - Conditional
| I | would | stumble |
| You | would | stumble |
| She | would | stumble |
| We | would | stumble |
| They | would | stumble |
Perfect - Conditional
| I | would | have | stumbled |
| You | would | have | stumbled |
| She | would | have | stumbled |
| We | would | have | stumbled |
| They | would | have | stumbled |