| I | contaminate |
|---|---|
| you | contaminate |
| he/she/it | contaminates |
| we | contaminate |
| you | contaminate |
| they | contaminate |
| I | contaminated |
|---|---|
| you | contaminated |
| he/she/it | contaminated |
| we | contaminated |
| you | contaminated |
| they | contaminated |
| I | have | contaminated |
|---|---|---|
| you | have | contaminated |
| he/she/it | has | contaminated |
| we | have | contaminated |
| you | have | contaminated |
| they | have | contaminated |
| I | had | contaminated |
|---|---|---|
| you | had | contaminated |
| he/she/it | had | contaminated |
| we | had | contaminated |
| you | had | contaminated |
| they | had | contaminated |
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