Hi, It's a discount for all seniors, so #2 is best. #3 is OK. I also hear, rather casually, 'I qualify for the senior discount'.
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CliveI can certainly see your point. With the context: "He is qualified to...". I am among those who were taught to view this type of sentences as passive. i.e. John was completely wiped out /exhausted from working 24 hours straight in the office to get the pre
I see 'qualified for Medicare' as an adjectival phrase.