In the sentences provided, the word "trouble" is used as a different part of speech:
1. In the sentence "He was troubled by his past life," the word "troubled" is used as a verb. It shows that he was experiencing distress or worry due to his past life.
2. In the sentence "Larry and I were in great trouble," the word "trouble" is used as a noun. It indicates that Larry and I were facing a difficult or worrisome situation.
So, the correct identification of the word "trouble" in the given sentences is:
B] Verb/Noun
