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