Enchanted "So for the next 24 hours, we guarantee a safe passage to all the aliens leaving / who/that [will] leave our solar system" The participle is used as a relative clause equivalent. Similar examples: The man entering the building looked old. (= who/that entered) The boys playing tennis are very skillful.
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Enchanted"So for the next 24 hours, we guarantee a safe passage to all the aliens leaving / who/that [will] leave our solar system"
EnchantedHappy Sunday:I believe by inserting 'who are' in the sentence, it should be clear to you why 'to leave' cannot be used.
A question about verb+ing:
"So for the next 24 hours, we guarantee a safe passage to all the aliens who are leaving our solar system"
Why leaving instead of to leave is used here?