| Simple | Progressive | Perfect | Progressive |
| Present |
| I constrain |
| you constrain |
| he/she/it constrains |
| we constrain |
| you all constrain |
| they constrain |
|
| I am constraining |
| you are constraining |
| he/she/it is constraining |
| we are constraining |
| you all are constraining |
| they are constraining |
|
| I have constrained |
| you have constrained |
| he/she/it has constrained |
| we have constrained |
| you all have constrained |
| they have constrained |
|
| I have been constraining |
| you have been constraining |
| he/she/it has been constraining |
| we have been constraining |
| you all have been constraining |
| they have been constraining |
|
| Past |
| I constrained |
| you constrained |
| he/she/it constrained |
| we constrained |
| you all constrained |
| they constrained |
|
| I was constraining |
| you were constraining |
| he/she/it was constraining |
| we were constraining |
| you all were constraining |
| they were constraining |
|
| I had constrained |
| you had constrained |
| he/she/it had constrained |
| we had constrained |
| you all had constrained |
| they had constrained |
|
| I had been constraining |
| you had been constraining |
| he/she/it had been constraining |
| we had been constraining |
| you all had been constraining |
| they had been constraining |
|
| Future |
| I will constrain |
| you will constrain |
| he/she/it will constrain |
| we will constrain |
| you all will constrain |
| they will constrain |
|
| I will be constraining |
| you will be constraining |
| he/she/it will be constraining |
| we are constraining |
| you all will be constraining |
| they will be constraining |
|
| I will have constrained |
| you will have constrained |
| he/she/it will have constrained |
| we will have constrained |
| you all will have constrained |
| they will have constrained |
|
| I will have been constraining |
| you will have been constraining |
| he/she/it will have been constraining |
| we will have been constraining |
| you all will have been constraining |
| they will have been constraining |
|
