| singular | plural |
| Infinitive | | |
| underlie | |
| present simple | | |
| 1 | I underlie | we underlie |
| 2 | you underlie | you underlie |
| 3 | he/she/it underlies | they underlie |
| past simple | | |
| 1 | I underlay | we underlay |
| 2 | you underlay | you underlay |
| 3 | he/she/it underlay | they underlay |
| future simple | | |
| 1 | I will/shall underlie | we will/shall underlie |
| 2 | you will/shall underlie | you will/shall underlie |
| 3 | he/she/it will/shall underlie | they will/shall underlie |
| conditional simple | | |
| 1 | I would underlie | we would underlie |
| 2 | you would underlie | you would underlie |
| 3 | he/she/it would underlie | they would underlie |
| present continuous | | |
| 1 | I am underlying | we are underlying |
| 2 | you are underlying | you are underlying |
| 3 | he/she/it is underlying | they are underlying |
| past continuous | | |
| 1 | I was underlying | we were underlying |
| 2 | you were underlying | you were underlying |
| 3 | he/she/it was underlying | they were underlying |
| future continuous | | |
| 1 | I will be underlying | we will be underlying |
| 2 | you will be underlying | you will be underlying |
| 3 | he/she/it will be underlying | they will be underlying |
| conditional continuous | | |
| 1 | I would be underlying | we would be underlying |
| 2 | you would be underlying | you would be underlying |
| 3 | he/she/it would be underlying | they would be underlying |
| present perfect | | |
| 1 | I have underlain | we have underlain |
| 2 | you have underlain | you have underlain |
| 3 | he/she/it has underlain | they have underlain |
| past perfect | | |
| 1 | I had underlain | we had underlain |
| 2 | you had underlain | you had underlain |
| 3 | he/she/it had underlain | they had underlain |
| future perfect | | |
| 1 | I will have underlain | we will have underlain |
| 2 | you will have underlain | you will have underlain |
| 3 | he/she/it will have underlain | they will have underlain |
| conditional perfect | | |
| 1 | I would have underlain | we would have underlain |
| 2 | you would have underlain | you would have underlain |
| 3 | he/she/it would have underlain | they would have underlain |
