| I | cooperate |
|---|---|
| you | cooperate |
| he/she/it | cooperates |
| we | cooperate |
| you | cooperate |
| they | cooperate |
| I | cooperated |
|---|---|
| you | cooperated |
| he/she/it | cooperated |
| we | cooperated |
| you | cooperated |
| they | cooperated |
| I | have | cooperated |
|---|---|---|
| you | have | cooperated |
| he/she/it | has | cooperated |
| we | have | cooperated |
| you | have | cooperated |
| they | have | cooperated |
| I | had | cooperated |
|---|---|---|
| you | had | cooperated |
| he/she/it | had | cooperated |
| we | had | cooperated |
| you | had | cooperated |
| they | had | cooperated |
单语范例（未经PONS编辑处理）
During their research, they have cooperated throughout the discussion of several sub-topics.
en.wikipedia.org If one cooperates and the other defects, then the defecting player gets $101, while the cooperating player gets nothing.
en.wikipedia.org Too much, in this particular, is expected from them, and too little is done by officers to cooperate with them.
en.wikipedia.org Investigators say that he refused to cooperate in a police investigation and lied about facts during the investigation.
en.wikipedia.org This proved to be an exceptionally effective sanction, quickly showing the other side the advantages of cooperating.
en.wikipedia.org