| Present "underlie" | I | underlie | |
| Present Continuous "underlie" | I | am underlying | |
| Simple past "underlie" | I | underlay | |
| Past Continuous "underlie" | I | was underlying | |
| Present perfect "underlie" | I | have underlain | |
| Present perfect continuous "underlie" | I | have been underlying | |
| Past perfect "underlie" | I | had underlain | |
| Past perfect continuous "underlie" | I | had been underlying | |
| Future "underlie" | I | will underlie | |
| Future continuous "underlie" | I | will be underlying | |
| Future perfect "underlie" | I | will have underlain | |
| Future perfect continuous "underlie" | I | will have been underlying |