Present
| I | constrain |
| You | constrain |
| She | constrains |
| We | constrain |
| They | constrain |
Past
| I | constrained |
| You | constrained |
| She | constrained |
| We | constrained |
| They | constrained |
Perfect
| I | have | constrained |
| You | have | constrained |
| She | has | constrained |
| We | have | constrained |
| They | have | constrained |
Future
| I | will | constrain |
| You | will | constrain |
| She | will | constrain |
| We | will | constrain |
| They | will | constrain |
Past Perfect
| I | had | constrained |
| You | had | constrained |
| She | had | constrained |
| We | had | constrained |
| They | had | constrained |
Future Perfect
| I | will | have | constrained |
| You | will | have | constrained |
| She | will | have | constrained |
| We | will | have | constrained |
| They | will | have | constrained |
Present - Conditional
| I | would | constrain |
| You | would | constrain |
| She | would | constrain |
| We | would | constrain |
| They | would | constrain |
Perfect - Conditional
| I | would | have | constrained |
| You | would | have | constrained |
| She | would | have | constrained |
| We | would | have | constrained |
| They | would | have | constrained |