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There are multiple uses for both 了 and 过, so it's good you are just asking about usage to express past action or events. 了, as you probably know, is often used to express a change of state. Perhaps somewhat relatedly, 了 can be used to express a past action that is still ongoing. But 过 cannot: when 过 is used to refer to a past event, that past event must ...

曾经 is more equivalent to "once" in English as in the sentence Once we were the best friends. It is used to: express the fact the sentence is talking about happened in the past. if the predicate verb is a durative verb*, express that fact can't be experienced(经=experience) by the speaker(doesn't last) any more. , the speaker implies that the ...

Just as 已经 means "already" and emphasizes the sense of the completed action particle 了, 曾经 means "once" and emphasizes the sense of 过. I disagree with Bob that 曾经 means already here; in general "once" or "ever" is a better translation. I would render your sentence as "I once studied two years of Chinese in Beijing."

In my opinion, you can use "了" right after the verb or at the end of the sentence when "了" is used to show the past tense. However, in your case, that's another thing that I want to clarify. I think, "去面试" should be treated as one phrasal verb, something like the phrasal verb "go fishing", "go shopping" in English.Here "面试" (interview) is a noun which has a ...