Final answer:
The sentence 'Tu estudias el español.' should be corrected to 'Tú estudias el español.' The subject of the sentence is 'Tú', which means 'you' in Spanish.
Step-by-step explanation:
Tu estudias el español.
The corrected sentence should be Tú estudias el español.
The subject of the sentence is 'Tú', which means 'you' in Spanish. The verb 'estudias' means 'study' or 'are studying', and 'el español' means 'Spanish'.
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