| I | quieten |
|---|---|
| you | quieten |
| he/she/it | quietens |
| we | quieten |
| you | quieten |
| they | quieten |
| I | quietened |
|---|---|
| you | quietened |
| he/she/it | quietened |
| we | quietened |
| you | quietened |
| they | quietened |
| I | have | quietened |
|---|---|---|
| you | have | quietened |
| he/she/it | has | quietened |
| we | have | quietened |
| you | have | quietened |
| they | have | quietened |
| I | had | quietened |
|---|---|---|
| you | had | quietened |
| he/she/it | had | quietened |
| we | had | quietened |
| you | had | quietened |
| they | had | quietened |
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单语范例（未经PONS编辑处理）
This appears to quieten their hearts as well.
en.wikipedia.org I've heard anecdotally that since the trees have been cleared, it's quietened down a lot!
www.telegraph.co.uk By analyzing the entire sequence of events, from the source to the observer, an acoustic scientist can provide many ways to quieten the machine.
en.wikipedia.org A bag is put over its head, to quieten it.
en.wikipedia.org After several minutes of intense orchestral involvement, the piece suddenly quietens and the second theme is eerily restated on the cello in very high register.
en.wikipedia.org