| singular | plural |
| Infinitive | | |
| undermine | |
| present simple | | |
| 1 | I undermine | we undermine |
| 2 | you undermine | you undermine |
| 3 | he/she/it undermines | they undermine |
| past simple | | |
| 1 | I undermined | we undermined |
| 2 | you undermined | you undermined |
| 3 | he/she/it undermined | they undermined |
| future simple | | |
| 1 | I will/shall undermine | we will/shall undermine |
| 2 | you will/shall undermine | you will/shall undermine |
| 3 | he/she/it will/shall undermine | they will/shall undermine |
| conditional simple | | |
| 1 | I would undermine | we would undermine |
| 2 | you would undermine | you would undermine |
| 3 | he/she/it would undermine | they would undermine |
| present continuous | | |
| 1 | I am undermining | we are undermining |
| 2 | you are undermining | you are undermining |
| 3 | he/she/it is undermining | they are undermining |
| past continuous | | |
| 1 | I was undermining | we were undermining |
| 2 | you were undermining | you were undermining |
| 3 | he/she/it was undermining | they were undermining |
| future continuous | | |
| 1 | I will be undermining | we will be undermining |
| 2 | you will be undermining | you will be undermining |
| 3 | he/she/it will be undermining | they will be undermining |
| conditional continuous | | |
| 1 | I would be undermining | we would be undermining |
| 2 | you would be undermining | you would be undermining |
| 3 | he/she/it would be undermining | they would be undermining |
| present perfect | | |
| 1 | I have undermined | we have undermined |
| 2 | you have undermined | you have undermined |
| 3 | he/she/it has undermined | they have undermined |
| past perfect | | |
| 1 | I had undermined | we had undermined |
| 2 | you had undermined | you had undermined |
| 3 | he/she/it had undermined | they had undermined |
| future perfect | | |
| 1 | I will have undermined | we will have undermined |
| 2 | you will have undermined | you will have undermined |
| 3 | he/she/it will have undermined | they will have undermined |
| conditional perfect | | |
| 1 | I would have undermined | we would have undermined |
| 2 | you would have undermined | you would have undermined |
| 3 | he/she/it would have undermined | they would have undermined |
