| I | niff |
|---|---|
| you | niff |
| he/she/it | niffs |
| we | niff |
| you | niff |
| they | niff |
| I | niffed |
|---|---|
| you | niffed |
| he/she/it | niffed |
| we | niffed |
| you | niffed |
| they | niffed |
| I | have | niffed |
|---|---|---|
| you | have | niffed |
| he/she/it | has | niffed |
| we | have | niffed |
| you | have | niffed |
| they | have | niffed |
| I | had | niffed |
|---|---|---|
| you | had | niffed |
| he/she/it | had | niffed |
| we | had | niffed |
| you | had | niffed |
| they | had | niffed |
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