Wǒ gēn nǐ jiǎng, zuótiān nà shìr gēnběn bùshì nàyàng de.
Listen, that thing yesterday really wasn't like that at all.
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A conversational opener used to grab attention before sharing a story, complaint or recommendation. Close in function to English 'listen' or 'let me tell you'. 我告诉你 is a slightly more emphatic variant.