is there a predicate pronoun in this sentence?You must have strength.

Do you mean a predicate nominative? No.

In order to determine if there is a predicate pronoun in the sentence "You must have strength," we need to understand what a predicate pronoun is. A predicate pronoun is a pronoun that follows a linking verb and renames the subject of the sentence.

In this sentence, the verb "must have" is a modal verb phrase that expresses necessity. The subject of the sentence is "you," which is a pronoun referring to the person being addressed. However, there is no pronoun following the linking verb to rename the subject. Therefore, there is no predicate pronoun in this sentence.