| Simple | Progressive | Perfect | Progressive |
| Present |
| I descale |
| you descale |
| he/she/it descales |
| we descale |
| you all descale |
| they descale |
|
| I am descaling |
| you are descaling |
| he/she/it is descaling |
| we are descaling |
| you all are descaling |
| they are descaling |
|
| I have descaled |
| you have descaled |
| he/she/it has descaled |
| we have descaled |
| you all have descaled |
| they have descaled |
|
| I have been descaling |
| you have been descaling |
| he/she/it has been descaling |
| we have been descaling |
| you all have been descaling |
| they have been descaling |
|
| Past |
| I descaled |
| you descaled |
| he/she/it descaled |
| we descaled |
| you all descaled |
| they descaled |
|
| I was descaling |
| you were descaling |
| he/she/it was descaling |
| we were descaling |
| you all were descaling |
| they were descaling |
|
| I had descaled |
| you had descaled |
| he/she/it had descaled |
| we had descaled |
| you all had descaled |
| they had descaled |
|
| I had been descaling |
| you had been descaling |
| he/she/it had been descaling |
| we had been descaling |
| you all had been descaling |
| they had been descaling |
|
| Future |
| I will descale |
| you will descale |
| he/she/it will descale |
| we will descale |
| you all will descale |
| they will descale |
|
| I will be descaling |
| you will be descaling |
| he/she/it will be descaling |
| we are descaling |
| you all will be descaling |
| they will be descaling |
|
| I will have descaled |
| you will have descaled |
| he/she/it will have descaled |
| we will have descaled |
| you all will have descaled |
| they will have descaled |
|
| I will have been descaling |
| you will have been descaling |
| he/she/it will have been descaling |
| we will have been descaling |
| you all will have been descaling |
| they will have been descaling |
|
