Present
| I | theorise |
| You | theorise |
| She | theorises |
| We | theorise |
| They | theorise |
Past
| I | theorised |
| You | theorised |
| She | theorised |
| We | theorised |
| They | theorised |
Perfect
| I | have | theorised |
| You | have | theorised |
| She | has | theorised |
| We | have | theorised |
| They | have | theorised |
Future
| I | will | theorise |
| You | will | theorise |
| She | will | theorise |
| We | will | theorise |
| They | will | theorise |
Past Perfect
| I | had | theorised |
| You | had | theorised |
| She | had | theorised |
| We | had | theorised |
| They | had | theorised |
Future Perfect
| I | will | have | theorised |
| You | will | have | theorised |
| She | will | have | theorised |
| We | will | have | theorised |
| They | will | have | theorised |
Present - Conditional
| I | would | theorise |
| You | would | theorise |
| She | would | theorise |
| We | would | theorise |
| They | would | theorise |
Perfect - Conditional
| I | would | have | theorised |
| You | would | have | theorised |
| She | would | have | theorised |
| We | would | have | theorised |
| They | would | have | theorised |