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Once you have finished a draft of your book, you should read it out loud. Read it out loud to yourself and notice if you crack up at your own writing. This may be a good indication that your book might be funny to others. You can also read the book out loud to others, such as a friend or a family member to see if they laugh or find your writing funny. Perhaps you bring your funny book to a writing group and get feedback from others on whether it is funny or if it needs some work to get there. Or maybe you have a writing partner that you exchange work with so you can both critique each other and make your writing that much funnier. Accept feedback from others on how you can make your book funnier and push the humor a little more. It will only make your book stronger. Once you have received feedback on your book, you may be ready to revise it and polish it until it is at its best. Adjust any dialogue that comes across as forced or awkward instead of funny. Add in language that is more embellished and humorous so your writing comes across as funny. Remove any sentences that do not add to the humor in your book.
Read the book out loud. Show the book to others. Revise the book.