| Present "grimace" | I | grimace | |
| Present Continuous "grimace" | I | am grimacing | |
| Simple past "grimace" | I | grimaced | |
| Past Continuous "grimace" | I | was grimacing | |
| Present perfect "grimace" | I | have grimaced | |
| Present perfect continuous "grimace" | I | have been grimacing | |
| Past perfect "grimace" | I | had grimaced | |
| Past perfect continuous "grimace" | I | had been grimacing | |
| Future "grimace" | I | will grimace | |
| Future continuous "grimace" | I | will be grimacing | |
| Future perfect "grimace" | I | will have grimaced | |
| Future perfect continuous "grimace" | I | will have been grimacing |