| I | lengthen |
|---|---|
| you | lengthen |
| he/she/it | lengthens |
| we | lengthen |
| you | lengthen |
| they | lengthen |
| I | lengthened |
|---|---|
| you | lengthened |
| he/she/it | lengthened |
| we | lengthened |
| you | lengthened |
| they | lengthened |
| I | have | lengthened |
|---|---|---|
| you | have | lengthened |
| he/she/it | has | lengthened |
| we | have | lengthened |
| you | have | lengthened |
| they | have | lengthened |
| I | had | lengthened |
|---|---|---|
| you | had | lengthened |
| he/she/it | had | lengthened |
| we | had | lengthened |
| you | had | lengthened |
| they | had | lengthened |
单语范例（未经PONS编辑处理）
The trunk is very low to subterranean in young plants, but lengthens above ground with age.
en.wikipedia.org Failure to stimulate the economy by public or private sectors will just unnecessarily lengthen the current economic depression and make it worse.
en.wikipedia.org It is also lengthened relative to the other vowels in the phrase.
en.wikipedia.org The church was lengthened by nine feet in 1631.
en.wikipedia.org The wheelbase was later lengthened from the initial 100in mm to convert.
en.wikipedia.org