In this paper are presented morphological sound changes. Since they are divided into phonologically conditioned sound changes and morphologically conditioned sound changes, they are divided into two groups. However, the entire work is permeated exclusively with morphologically conditioned voice changes. The descriptions are mainly based on contemporary grammars, namely the grammar Težak and Babić (2016), Eugenija Barić and associates (2005) and Silić and Pranjković (2007). It is important to point that grammar od Eugenija Barić et al. (2005) contains the most extensive description and the largest number of exambles and most of the work is based on that grammar. The similarities and differences between these three grammars are highlited in terms of how morphological sound changes are described in each grammar. An overview od sound changes in three orthographies will be presented. We will use the orthograpy of Badurina, Marković and Mićanović (2008), Babić and Moguš (2010) and Jozić et al. (2013). The method of describing morphologically determined sound changes in the textbook of Dragica Dujmović Markusi and Vedrana Močnik (2021) for the fourth grade of secondary school will be presented.