This example uses the Present Perfect with the past participle of 'sleep' (slept) in the negative to explain the reason for tiredness at the present moment.
Este exemplo usa o Present Perfect com o particípio passado de 'sleep' (slept) na negativa para explicar a razão do cansaço no momento presente.
| Front | I'm sorry I'm so tired. I haven't --- (sleep). |
|---|---|
| Back | I'm sorry I'm so tired. I haven't slept. |
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