Final answer:
No, the sentence "Yo estoy nado" is not grammatically correct in Spanish. The correct sentence is "Yo estoy nadando" which means "I am swimming".
Step-by-step explanation:
No, the sentence "Yo estoy nado" is not grammatically correct in Spanish. The verb "nadar" (to swim) is an infinitive form, and should not be used after the verb "estar" (to be) in this way. Instead, you can use the present participle form "nadando", resulting in the correct sentence "Yo estoy nadando" which means "I am swimming".
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