The Sentence Diagram Generator visually represents the grammatical structure of the sentence: "Weakened by the cold, Kyle's immune system couldn't prevent the pneumonia."

1. Main Clause: "Kyle's immune system couldn't prevent the pneumonia"

   • Subject: "Kyle's immune system"
   • Predicate: "couldn't prevent the pneumonia"
     • Verb: "couldn't prevent"
     • Direct Object: "the pneumonia"

2. Participial Phrase: "Weakened by the cold"

   • Participle: "Weakened"
   • Prepositional Phrase: "by the cold"
     • Preposition: "by"
     • Object of the Preposition: "the cold"

The diagram would visually connect these elements, showing the relationship between the participial phrase and the main clause, illustrating how the weakened state of the immune system affects its ability to prevent pneumonia.