The pronoun "he" is substituting for the noun "Jim".
In this sentence, the pronoun "he" is substituting for the noun "Jim".
In the sentence, the pronoun "he" is substituting for the noun "Jim." To determine this, you can look for the noun that is the subject of the main clause. In this case, "Jim" is the subject of the main clause "Jim watched." Therefore, the pronoun "he" is referring to "Jim." Identification of pronoun reference requires understanding the context and the relationship between the nouns and pronouns in a sentence.