| Simple | Progressive | Perfect | Progressive |
| Present |
| I challenge |
| you challenge |
| he/she/it challenges |
| we challenge |
| you all challenge |
| they challenge |
|
| I am challenging |
| you are challenging |
| he/she/it is challenging |
| we are challenging |
| you all are challenging |
| they are challenging |
|
| I have challenged |
| you have challenged |
| he/she/it has challenged |
| we have challenged |
| you all have challenged |
| they have challenged |
|
| I have been challenging |
| you have been challenging |
| he/she/it has been challenging |
| we have been challenging |
| you all have been challenging |
| they have been challenging |
|
| Past |
| I challenged |
| you challenged |
| he/she/it challenged |
| we challenged |
| you all challenged |
| they challenged |
|
| I was challenging |
| you were challenging |
| he/she/it was challenging |
| we were challenging |
| you all were challenging |
| they were challenging |
|
| I had challenged |
| you had challenged |
| he/she/it had challenged |
| we had challenged |
| you all had challenged |
| they had challenged |
|
| I had been challenging |
| you had been challenging |
| he/she/it had been challenging |
| we had been challenging |
| you all had been challenging |
| they had been challenging |
|
| Future |
| I will challenge |
| you will challenge |
| he/she/it will challenge |
| we will challenge |
| you all will challenge |
| they will challenge |
|
| I will be challenging |
| you will be challenging |
| he/she/it will be challenging |
| we are challenging |
| you all will be challenging |
| they will be challenging |
|
| I will have challenged |
| you will have challenged |
| he/she/it will have challenged |
| we will have challenged |
| you all will have challenged |
| they will have challenged |
|
| I will have been challenging |
| you will have been challenging |
| he/she/it will have been challenging |
| we will have been challenging |
| you all will have been challenging |
| they will have been challenging |
|
