| Simple | Progressive | Perfect | Progressive |
| Present |
| I lengthen |
| you lengthen |
| he/she/it lengthens |
| we lengthen |
| you all lengthen |
| they lengthen |
|
| I am lengthening |
| you are lengthening |
| he/she/it is lengthening |
| we are lengthening |
| you all are lengthening |
| they are lengthening |
|
| I have lengthened |
| you have lengthened |
| he/she/it has lengthened |
| we have lengthened |
| you all have lengthened |
| they have lengthened |
|
| I have been lengthening |
| you have been lengthening |
| he/she/it has been lengthening |
| we have been lengthening |
| you all have been lengthening |
| they have been lengthening |
|
| Past |
| I lengthened |
| you lengthened |
| he/she/it lengthened |
| we lengthened |
| you all lengthened |
| they lengthened |
|
| I was lengthening |
| you were lengthening |
| he/she/it was lengthening |
| we were lengthening |
| you all were lengthening |
| they were lengthening |
|
| I had lengthened |
| you had lengthened |
| he/she/it had lengthened |
| we had lengthened |
| you all had lengthened |
| they had lengthened |
|
| I had been lengthening |
| you had been lengthening |
| he/she/it had been lengthening |
| we had been lengthening |
| you all had been lengthening |
| they had been lengthening |
|
| Future |
| I will lengthen |
| you will lengthen |
| he/she/it will lengthen |
| we will lengthen |
| you all will lengthen |
| they will lengthen |
|
| I will be lengthening |
| you will be lengthening |
| he/she/it will be lengthening |
| we are lengthening |
| you all will be lengthening |
| they will be lengthening |
|
| I will have lengthened |
| you will have lengthened |
| he/she/it will have lengthened |
| we will have lengthened |
| you all will have lengthened |
| they will have lengthened |
|
| I will have been lengthening |
| you will have been lengthening |
| he/she/it will have been lengthening |
| we will have been lengthening |
| you all will have been lengthening |
| they will have been lengthening |
|
