| I | sharpen |
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| you | sharpen |
| he/she/it | sharpens |
| we | sharpen |
| you | sharpen |
| they | sharpen |
| I | sharpened |
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| you | sharpened |
| he/she/it | sharpened |
| we | sharpened |
| you | sharpened |
| they | sharpened |
| I | have | sharpened |
|---|---|---|
| you | have | sharpened |
| he/she/it | has | sharpened |
| we | have | sharpened |
| you | have | sharpened |
| they | have | sharpened |
| I | had | sharpened |
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| you | had | sharpened |
| he/she/it | had | sharpened |
| we | had | sharpened |
| you | had | sharpened |
| they | had | sharpened |
单语范例（未经PONS编辑处理）
Early growth stages are depressed, subglobular, smooth or ribbled, with an open umbilcus and rounded to suboxyconic venter, which sharpens relatively early during ontogeny.
en.wikipedia.org His head, its mouth still full of grass, was placed on a pike--a long, sharpened, wooden pole--and paraded through the streets.
en.wikipedia.org The large ears are to sharpen hearing, and the distinctive coloration may help bongos identify one another in their dark forest habitats.
en.wikipedia.org Tools were sharpened by heating and hammering rather than sharpening with a file.
en.wikipedia.org The allows emerging and experienced directing students to concentrate solely on sharpening their craft.
en.wikipedia.org