The: when the listener already knows which thing we are talking about because it was mentioned before or because there's only one of them, When we talk about a particular group of things, when it’s clear what we’re referring to, when there’s only one of something, with superlatives, A / An: Jobs, when we talk about something for the first time, when we say what something is / what somebody does, the first time we mention a thing/person, in exclamations with What…!, in expressions of frequency,

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