This book is about presuppositions in the book Sons and Lovers. The author lists all the dialogues in the book Sons and Lovers, and picks up all the triggered sentences with what Levinson said about the presupposition triggers, sets up a database with all the triggers and sentences, then analyses the sentences with triggers which are worth studying. The book makes a statistic analysis of presupposition triggers in the dialogues of the novel at lexical and syntactic levels, and analyses the proportions and functions of presupposition triggers in the texts as well.