| Present "crumple" | I | crumple | |
| Present Continuous "crumple" | I | am crumpling | |
| Simple past "crumple" | I | crumpled | |
| Past Continuous "crumple" | I | was crumpling | |
| Present perfect "crumple" | I | have crumpled | |
| Present perfect continuous "crumple" | I | have been crumpling | |
| Past perfect "crumple" | I | had crumpled | |
| Past perfect continuous "crumple" | I | had been crumpling | |
| Future "crumple" | I | will crumple | |
| Future continuous "crumple" | I | will be crumpling | |
| Future perfect "crumple" | I | will have crumpled | |
| Future perfect continuous "crumple" | I | will have been crumpling |