Articles are one of the trickiest things about English. The general rule is that a/an is used when introducing something for the first time. Study the following example: I saw a man and a woman sitting on a bench.
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Vincent TeoSo, what is the best answer?The correct answer is as stated by the previous poster: "The general rule is that a/an is used when introducing something for the first time." Use 'the' after you have defined it/them.