| I | observe |
|---|---|
| you | observe |
| he/she/it | observes |
| we | observe |
| you | observe |
| they | observe |
| I | observed |
|---|---|
| you | observed |
| he/she/it | observed |
| we | observed |
| you | observed |
| they | observed |
| I | have | observed |
|---|---|---|
| you | have | observed |
| he/she/it | has | observed |
| we | have | observed |
| you | have | observed |
| they | have | observed |
| I | had | observed |
|---|---|---|
| you | had | observed |
| he/she/it | had | observed |
| we | had | observed |
| you | had | observed |
| they | had | observed |
单语范例（未经PONS编辑处理）
All volunteers had to observe me ventilate anaesthetised and curarized patients without a tracheal tube.
en.wikipedia.org Some bees observe over 50 waggle runs without successfully foraging, while others will forage successfully after observing 5 runs.
en.wikipedia.org There are animals whose ears are more sensitive than any microphone and the creatures who observe their surroundings with three-dimensional sonars or electro-magnetic sensors.
en.wikipedia.org He used a series of filters, made mainly from wadding, in attempts to capture and observe microorganisms.
en.wikipedia.org In it the protagonist instructs his sons to observe the requirements of nurturing a household "(grihasta)".
en.wikipedia.org