Present
| I | lengthen |
| You | lengthen |
| She | lengthens |
| We | lengthen |
| They | lengthen |
Past
| I | lengthened |
| You | lengthened |
| She | lengthened |
| We | lengthened |
| They | lengthened |
Perfect
| I | have | lengthened |
| You | have | lengthened |
| She | has | lengthened |
| We | have | lengthened |
| They | have | lengthened |
Future
| I | will | lengthen |
| You | will | lengthen |
| She | will | lengthen |
| We | will | lengthen |
| They | will | lengthen |
Past Perfect
| I | had | lengthened |
| You | had | lengthened |
| She | had | lengthened |
| We | had | lengthened |
| They | had | lengthened |
Future Perfect
| I | will | have | lengthened |
| You | will | have | lengthened |
| She | will | have | lengthened |
| We | will | have | lengthened |
| They | will | have | lengthened |
Present - Conditional
| I | would | lengthen |
| You | would | lengthen |
| She | would | lengthen |
| We | would | lengthen |
| They | would | lengthen |
Perfect - Conditional
| I | would | have | lengthened |
| You | would | have | lengthened |
| She | would | have | lengthened |
| We | would | have | lengthened |
| They | would | have | lengthened |