A may mean an event, or an event's profit such like earn 10 dollars in one gambling game.
Is there any problem in using
like is an prep and after the present participle?
And in a gambling game,
earn is not a good word to use here?
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When referring to gambling, I would use the word win, rather than "earn," because it is the result of luck, not skill.
Used as a gerund, one would use the "ing" form; e.g., the event of "winn ing $10..."