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Can you help me with pronoun case?
Pedro Martinez`signed a baseball for Chad that he had used in a game.

Certainly! Pronoun case refers to the form of a pronoun that is used depending on its function in a sentence. In the sentence you provided, "that he had used in a game" is an essential part of the sentence and it modifies "baseball." Let's break down the sentence to understand the pronoun case more clearly.

"Pedro Martinez signed a baseball for Chad." Here, "Pedro Martinez" is the subject of the sentence, "signed" is the verb, and "a baseball for Chad" is the direct object.

The next part, "that he had used in a game," provides more information about the baseball that Pedro Martinez signed. The pronoun "he" is used to refer back to Pedro Martinez. However, the pronoun "he" could potentially create ambiguity because it could refer to either Pedro Martinez or Chad.

To make the sentence clear, you can rewrite it like this: "Pedro Martinez signed a baseball, which he had used in a game, for Chad." In this version, "which" is used as a pronoun to refer back to the earlier noun "baseball."

Overall, when encountering a sentence with pronouns, it's essential to consider the context and look for clarity. In cases like this, using a relative pronoun like "which" can help avoid confusion by clearly referring to the intended noun.