| Present "underbid" | I | underbid | |
| Present Continuous "underbid" | I | am underbidding | |
| Simple past "underbid" | I | underbid | |
| Past Continuous "underbid" | I | was underbidding | |
| Present perfect "underbid" | I | have underbid | |
| Present perfect continuous "underbid" | I | have been underbidding | |
| Past perfect "underbid" | I | had underbid | |
| Past perfect continuous "underbid" | I | had been underbidding | |
| Future "underbid" | I | will underbid | |
| Future continuous "underbid" | I | will be underbidding | |
| Future perfect "underbid" | I | will have underbid | |
| Future perfect continuous "underbid" | I | will have been underbidding |