| Simple | Progressive | Perfect | Progressive |
| Present |
| I curtail |
| you curtail |
| he/she/it curtails |
| we curtail |
| you all curtail |
| they curtail |
|
| I am curtailing |
| you are curtailing |
| he/she/it is curtailing |
| we are curtailing |
| you all are curtailing |
| they are curtailing |
|
| I have curtailed |
| you have curtailed |
| he/she/it has curtailed |
| we have curtailed |
| you all have curtailed |
| they have curtailed |
|
| I have been curtailing |
| you have been curtailing |
| he/she/it has been curtailing |
| we have been curtailing |
| you all have been curtailing |
| they have been curtailing |
|
| Past |
| I curtailed |
| you curtailed |
| he/she/it curtailed |
| we curtailed |
| you all curtailed |
| they curtailed |
|
| I was curtailing |
| you were curtailing |
| he/she/it was curtailing |
| we were curtailing |
| you all were curtailing |
| they were curtailing |
|
| I had curtailed |
| you had curtailed |
| he/she/it had curtailed |
| we had curtailed |
| you all had curtailed |
| they had curtailed |
|
| I had been curtailing |
| you had been curtailing |
| he/she/it had been curtailing |
| we had been curtailing |
| you all had been curtailing |
| they had been curtailing |
|
| Future |
| I will curtail |
| you will curtail |
| he/she/it will curtail |
| we will curtail |
| you all will curtail |
| they will curtail |
|
| I will be curtailing |
| you will be curtailing |
| he/she/it will be curtailing |
| we are curtailing |
| you all will be curtailing |
| they will be curtailing |
|
| I will have curtailed |
| you will have curtailed |
| he/she/it will have curtailed |
| we will have curtailed |
| you all will have curtailed |
| they will have curtailed |
|
| I will have been curtailing |
| you will have been curtailing |
| he/she/it will have been curtailing |
| we will have been curtailing |
| you all will have been curtailing |
| they will have been curtailing |
|
