| Simple | Progressive | Perfect | Progressive |
| Present |
| I crumple |
| you crumple |
| he/she/it crumples |
| we crumple |
| you all crumple |
| they crumple |
|
| I am crumpling |
| you are crumpling |
| he/she/it is crumpling |
| we are crumpling |
| you all are crumpling |
| they are crumpling |
|
| I have crumpled |
| you have crumpled |
| he/she/it has crumpled |
| we have crumpled |
| you all have crumpled |
| they have crumpled |
|
| I have been crumpling |
| you have been crumpling |
| he/she/it has been crumpling |
| we have been crumpling |
| you all have been crumpling |
| they have been crumpling |
|
| Past |
| I crumpled |
| you crumpled |
| he/she/it crumpled |
| we crumpled |
| you all crumpled |
| they crumpled |
|
| I was crumpling |
| you were crumpling |
| he/she/it was crumpling |
| we were crumpling |
| you all were crumpling |
| they were crumpling |
|
| I had crumpled |
| you had crumpled |
| he/she/it had crumpled |
| we had crumpled |
| you all had crumpled |
| they had crumpled |
|
| I had been crumpling |
| you had been crumpling |
| he/she/it had been crumpling |
| we had been crumpling |
| you all had been crumpling |
| they had been crumpling |
|
| Future |
| I will crumple |
| you will crumple |
| he/she/it will crumple |
| we will crumple |
| you all will crumple |
| they will crumple |
|
| I will be crumpling |
| you will be crumpling |
| he/she/it will be crumpling |
| we are crumpling |
| you all will be crumpling |
| they will be crumpling |
|
| I will have crumpled |
| you will have crumpled |
| he/she/it will have crumpled |
| we will have crumpled |
| you all will have crumpled |
| they will have crumpled |
|
| I will have been crumpling |
| you will have been crumpling |
| he/she/it will have been crumpling |
| we will have been crumpling |
| you all will have been crumpling |
| they will have been crumpling |
|
