| Simple | Progressive | Perfect | Progressive |
| Present |
| I underbid |
| you underbid |
| he/she/it underbids |
| we underbid |
| you all underbid |
| they underbid |
|
| I am underbidding |
| you are underbidding |
| he/she/it is underbidding |
| we are underbidding |
| you all are underbidding |
| they are underbidding |
|
| I have underbid |
| you have underbid |
| he/she/it has underbid |
| we have underbid |
| you all have underbid |
| they have underbid |
|
| I have been underbidding |
| you have been underbidding |
| he/she/it has been underbidding |
| we have been underbidding |
| you all have been underbidding |
| they have been underbidding |
|
| Past |
| I underbid |
| you underbid |
| he/she/it underbid |
| we underbid |
| you all underbid |
| they underbid |
|
| I was underbidding |
| you were underbidding |
| he/she/it was underbidding |
| we were underbidding |
| you all were underbidding |
| they were underbidding |
|
| I had underbid |
| you had underbid |
| he/she/it had underbid |
| we had underbid |
| you all had underbid |
| they had underbid |
|
| I had been underbidding |
| you had been underbidding |
| he/she/it had been underbidding |
| we had been underbidding |
| you all had been underbidding |
| they had been underbidding |
|
| Future |
| I will underbid |
| you will underbid |
| he/she/it will underbid |
| we will underbid |
| you all will underbid |
| they will underbid |
|
| I will be underbidding |
| you will be underbidding |
| he/she/it will be underbidding |
| we are underbidding |
| you all will be underbidding |
| they will be underbidding |
|
| I will have underbid |
| you will have underbid |
| he/she/it will have underbid |
| we will have underbid |
| you all will have underbid |
| they will have underbid |
|
| I will have been underbidding |
| you will have been underbidding |
| he/she/it will have been underbidding |
| we will have been underbidding |
| you all will have been underbidding |
| they will have been underbidding |
|
