Learn is one of the small group of verbs which have alternative forms for the past tense and past participle. Usage varies according to the variety of English you speak. The Oxford English Corpus shows that in British English and many other varieties learnt is relatively common both as the past participle and the past tense: I’ve really learnt a lot from TV, painters learnt their craft the hard way. In North American English, however, these uses are rather uncommon. Using the form ending in -ed is therefore always a safe choice.
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