Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to write an introduction to a book [title] Summarize or outline the book. [step] If you have an outline, pull it out to use in your introduction. If you don't have an outline, go chapter by chapter and write a short, paragraph-long summary of each chapter as your outline.

Ending1: [substeps] Think about your main ideas as you are writing notes for your introduction. Sketch out the overall themes of your book, so you have them ready. Ending2: Use these summaries to summarize your ideas for the upcoming book. [substeps] Summarize your ideas by creating a short list. Ending3: [substeps] Make sure that your summary is short, easily transportable, and connects the main main ideas of the book. Make sure you include all supporting characters as well. Ending4: Your summary should tell the reader a bit about the book and the main idea behind each chapter. [substeps] If you can get a response from the author, don't worry.

Answer format: ending1/ending2/ending3/ending4