Final answer:
Parallel structure in sentences requires using consistent grammar for equal elements, as seen in 'My best friend likes watching movies and playing basketball.'
Explanation:
Parallel structure in a sentence means using the same grammatical form for words, phrases, or clauses that express ideas of equal importance. In the sentence 'My best friend likes watching movies and playing basketball,' 'likes watching movies' and 'playing basketball' are in parallel form.
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