Present
| I | contribute |
| You | contribute |
| She | contributes |
| We | contribute |
| They | contribute |
Past
| I | contributed |
| You | contributed |
| She | contributed |
| We | contributed |
| They | contributed |
Perfect
| I | have | contributed |
| You | have | contributed |
| She | has | contributed |
| We | have | contributed |
| They | have | contributed |
Future
| I | will | contribute |
| You | will | contribute |
| She | will | contribute |
| We | will | contribute |
| They | will | contribute |
Past Perfect
| I | had | contributed |
| You | had | contributed |
| She | had | contributed |
| We | had | contributed |
| They | had | contributed |
Future Perfect
| I | will | have | contributed |
| You | will | have | contributed |
| She | will | have | contributed |
| We | will | have | contributed |
| They | will | have | contributed |
Present - Conditional
| I | would | contribute |
| You | would | contribute |
| She | would | contribute |
| We | would | contribute |
| They | would | contribute |
Perfect - Conditional
| I | would | have | contributed |
| You | would | have | contributed |
| She | would | have | contributed |
| We | would | have | contributed |
| They | would | have | contributed |