Present
| I | concentrate |
| You | concentrate |
| She | concentrates |
| We | concentrate |
| They | concentrate |
Past
| I | concentrated |
| You | concentrated |
| She | concentrated |
| We | concentrated |
| They | concentrated |
Perfect
| I | have | concentrated |
| You | have | concentrated |
| She | has | concentrated |
| We | have | concentrated |
| They | have | concentrated |
Future
| I | will | concentrate |
| You | will | concentrate |
| She | will | concentrate |
| We | will | concentrate |
| They | will | concentrate |
Past Perfect
| I | had | concentrated |
| You | had | concentrated |
| She | had | concentrated |
| We | had | concentrated |
| They | had | concentrated |
Future Perfect
| I | will | have | concentrated |
| You | will | have | concentrated |
| She | will | have | concentrated |
| We | will | have | concentrated |
| They | will | have | concentrated |
Present - Conditional
| I | would | concentrate |
| You | would | concentrate |
| She | would | concentrate |
| We | would | concentrate |
| They | would | concentrate |
Perfect - Conditional
| I | would | have | concentrated |
| You | would | have | concentrated |
| She | would | have | concentrated |
| We | would | have | concentrated |
| They | would | have | concentrated |