The document provides examples of alternative ways to join sentences without using "if", such as using "had" or "should" instead. It then gives tasks for the reader to rewrite sentences replacing "if" with one of the alternatives. Another section discusses using participles like "having" and "-ing" to combine sentences. It provides examples and tasks for the reader to practice this technique. Finally, it discusses replacing boring conjunctions like "and" and "but" with less common ones to make writing more varied.