Present
| I | grumble |
| You | grumble |
| She | grumbles |
| We | grumble |
| They | grumble |
Past
| I | grumbled |
| You | grumbled |
| She | grumbled |
| We | grumbled |
| They | grumbled |
Perfect
| I | have | grumbled |
| You | have | grumbled |
| She | has | grumbled |
| We | have | grumbled |
| They | have | grumbled |
Future
| I | will | grumble |
| You | will | grumble |
| She | will | grumble |
| We | will | grumble |
| They | will | grumble |
Past Perfect
| I | had | grumbled |
| You | had | grumbled |
| She | had | grumbled |
| We | had | grumbled |
| They | had | grumbled |
Future Perfect
| I | will | have | grumbled |
| You | will | have | grumbled |
| She | will | have | grumbled |
| We | will | have | grumbled |
| They | will | have | grumbled |
Present - Conditional
| I | would | grumble |
| You | would | grumble |
| She | would | grumble |
| We | would | grumble |
| They | would | grumble |
Perfect - Conditional
| I | would | have | grumbled |
| You | would | have | grumbled |
| She | would | have | grumbled |
| We | would | have | grumbled |
| They | would | have | grumbled |