Final answer:
The sentence contains a pronoun error; 'you' does not agree with the antecedent 'a person'. It should be corrected to either 'one' or 'they'. Pronouns must have clear antecedents and agree in number.
Step-by-step explanation:
The sentence "If a person wants to succeed in life, you really have to work at it." contains a pronoun error. The correct pronoun 'one' or 'they' should match with the generic noun 'a person'. Here's the corrected sentence: "If a person wants to succeed in life, one really has to work at it." or "If a person wants to succeed in life, they really have to work at it."
The error in the original sentence is due to a pronoun-antecedent agreement mistake. The pronoun 'you' does not match the antecedent 'a person'. A pronoun should refer to a clear and specific antecedent, and the use of 'one' or 'they' as a gender-neutral singular pronoun is in agreement with the singular noun 'person'. In English usage, 'one' or 'they' can be used as generic pronouns to refer to any person in a general sense, which is why they are correct in this context.