Present
| I | observe |
| You | observe |
| She | observes |
| We | observe |
| They | observe |
Past
| I | observed |
| You | observed |
| She | observed |
| We | observed |
| They | observed |
Perfect
| I | have | observed |
| You | have | observed |
| She | has | observed |
| We | have | observed |
| They | have | observed |
Future
| I | will | observe |
| You | will | observe |
| She | will | observe |
| We | will | observe |
| They | will | observe |
Past Perfect
| I | had | observed |
| You | had | observed |
| She | had | observed |
| We | had | observed |
| They | had | observed |
Future Perfect
| I | will | have | observed |
| You | will | have | observed |
| She | will | have | observed |
| We | will | have | observed |
| They | will | have | observed |
Present - Conditional
| I | would | observe |
| You | would | observe |
| She | would | observe |
| We | would | observe |
| They | would | observe |
Perfect - Conditional
| I | would | have | observed |
| You | would | have | observed |
| She | would | have | observed |
| We | would | have | observed |
| They | would | have | observed |