| Simple | Progressive | Perfect | Progressive |
| Present |
| I doubt |
| you doubt |
| he/she/it doubts |
| we doubt |
| you all doubt |
| they doubt |
|
| I am doubting |
| you are doubting |
| he/she/it is doubting |
| we are doubting |
| you all are doubting |
| they are doubting |
|
| I have doubted |
| you have doubted |
| he/she/it has doubted |
| we have doubted |
| you all have doubted |
| they have doubted |
|
| I have been doubting |
| you have been doubting |
| he/she/it has been doubting |
| we have been doubting |
| you all have been doubting |
| they have been doubting |
|
| Past |
| I doubted |
| you doubted |
| he/she/it doubted |
| we doubted |
| you all doubted |
| they doubted |
|
| I was doubting |
| you were doubting |
| he/she/it was doubting |
| we were doubting |
| you all were doubting |
| they were doubting |
|
| I had doubted |
| you had doubted |
| he/she/it had doubted |
| we had doubted |
| you all had doubted |
| they had doubted |
|
| I had been doubting |
| you had been doubting |
| he/she/it had been doubting |
| we had been doubting |
| you all had been doubting |
| they had been doubting |
|
| Future |
| I will doubt |
| you will doubt |
| he/she/it will doubt |
| we will doubt |
| you all will doubt |
| they will doubt |
|
| I will be doubting |
| you will be doubting |
| he/she/it will be doubting |
| we are doubting |
| you all will be doubting |
| they will be doubting |
|
| I will have doubted |
| you will have doubted |
| he/she/it will have doubted |
| we will have doubted |
| you all will have doubted |
| they will have doubted |
|
| I will have been doubting |
| you will have been doubting |
| he/she/it will have been doubting |
| we will have been doubting |
| you all will have been doubting |
| they will have been doubting |
|
