To find the title of a sentence in a book online, you can try the following methods: 1 Use an online search engine: Enter keywords such as "a sentence in a book" into the search engine and choose the most relevant title according to the ranking in the search results. 2. Reading related websites: Some novel, literature, and media websites provide discussions, reader reviews, and novel lists about the content of the novel. On these websites, you can find the title of the book related to a sentence in the book. 3. Use the library: Go to your local library or online library platform to find a database related to the title of the book. The database may contain a title related to a sentence in the book. 4. Use book classification systems: Some book classification systems such as JSTOR and Project Muse provide research, reader reviews, and citations on the book's content. You can find the title of a sentence related to the book on these websites. It should be noted that to find the title of the book, you need to have a certain understanding of the book. You can check the book's introduction, author, publishing house and other information to better determine the keywords and search results.