Final answer:
The sentence 'Yo uso este cuchillo' is grammatically correct in Spanish.
Step-by-step explanation:
The sentence 'Yo uso este cuchillo' is grammatically correct in Spanish. In this sentence, 'Yo' (I) is the subject, 'uso' (use) is the verb, and 'este cuchillo' (this knife) is the object. The sentence structure follows the typical subject-verb-object order in Spanish.
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