'Ago' means 'before now'. 'Before' refers to some early time.
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ac20001.) He moved there three years before. => So if this sentence ends with a full stop, no further context provided, would you consider it to be wrong?Yes, though I admit that some native speakers will utter it.
ac20002.) Would it be OK then to say e.g.:a) He moved there three years before he enrolled in university.T