have been grinning
-he estado sonriendo
Present perfect progressive conjugation of grin. There are other translations for this conjugation.
See all conjugations of grin

grin

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500+ learners.
Hysteria raged in political circles across Europe, and the terrorists must have been grinning.
La histeria cundió en los círculos políticos europeos y los terroristas deben de haber estado muy contentos.
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