| I | upend |
|---|---|
| you | upend |
| he/she/it | upends |
| we | upend |
| you | upend |
| they | upend |
| I | upended |
|---|---|
| you | upended |
| he/she/it | upended |
| we | upended |
| you | upended |
| they | upended |
| I | have | upended |
|---|---|---|
| you | have | upended |
| he/she/it | has | upended |
| we | have | upended |
| you | have | upended |
| they | have | upended |
| I | had | upended |
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| you | had | upended |
| he/she/it | had | upended |
| we | had | upended |
| you | had | upended |
| they | had | upended |
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单语范例（未经PONS编辑处理）
To prove this theory, he filled a long glass tube (sealed at one end) with mercury and upended it into a dish also containing mercury.
en.wikipedia.org When upended, it made a nice seat while waiting for the bus or train.
en.wikipedia.org Indirectly, it is upending the international monetary system.
en.wikipedia.org It walks well, without waddling, and although it normally feeds by upending, it can dive if necessary.
en.wikipedia.org The genre has been credited with upending the stereotype of gaming as a sedentary activity, and promoting an active lifestyle.
en.wikipedia.org