The sentence uses the Present Perfect with the past participle of 'fly' (flown) to describe an action that occurred at some point before the present.
A frase utiliza o Present Perfect com o particípio passado de 'fly' (flown) para descrever uma ação que ocorreu em algum momento antes do presente.
| Front | The birds have --- (fly) south for the winter. |
|---|---|
| Back | The birds have flown south for the winter. |
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