* Missing Pronoun: There is no pronoun in the sentence. Pronouns replace nouns to avoid repetition.
* Missing Antecedent: An antecedent is the noun that a pronoun refers to. Without a pronoun, there can't be an antecedent.
To fix the sentence, you need to add a pronoun and make it clear who the pronoun refers to. Here are some possibilities:
* "The man walks beside the woman." This uses the noun "woman" as the antecedent.
* "The man walks beside her." This uses the pronoun "her" to refer to a woman already mentioned.
It's important to use pronouns correctly to ensure clear and understandable writing.