Present
| I | understand |
| You | understand |
| She | understands |
| We | understand |
| They | understand |
Past
| I | understood |
| You | understood |
| She | understood |
| We | understood |
| They | understood |
Perfect
| I | have | understood |
| You | have | understood |
| She | has | understood |
| We | have | understood |
| They | have | understood |
Future
| I | will | understand |
| You | will | understand |
| She | will | understand |
| We | will | understand |
| They | will | understand |
Past Perfect
| I | had | understood |
| You | had | understood |
| She | had | understood |
| We | had | understood |
| They | had | understood |
Future Perfect
| I | will | have | understood |
| You | will | have | understood |
| She | will | have | understood |
| We | will | have | understood |
| They | will | have | understood |
Present - Conditional
| I | would | understand |
| You | would | understand |
| She | would | understand |
| We | would | understand |
| They | would | understand |
Perfect - Conditional
| I | would | have | understood |
| You | would | have | understood |
| She | would | have | understood |
| We | would | have | understood |
| They | would | have | understood |