Conservative languages are often thought of as being more complex grammatically (or at least morphologically) than innovative languages. That is largely true for Indo-European languages, where the parent language had an extremely complex morphology and the dominant pattern of language change has been simplified. On the other hand, a number of Arabic varieties commonly considered innovative, such as Egyptian Arabic, have developed a complex agglutinative system of verbal morphology out of the simpler system of Classical Arabic.[citation needed]