The broken plural (جمع التكسير) involve changing the internal structure of the word; that’s why they are called broken plurals. This change may involve adding letters inside the word (infixes), moving letters round, or following a certain pattern. Broken plurals are very tricky for non-native speakers, because there is not a single rule that you can learn to make a plural from a given word. However, there are certain patterns that are common to this category. In the examples below, I give some of the most common patterns of broken plurals and some examples of them.