For example, if a word is a noun, it should take one of three tags from the case category: nominative (n), accusative (a), or genitive (g), while it should take "not applicable" (na) from the mood category since mood is not defined for nominals.
most of the previous approaches in Arabic did not utilize this information, applying one model for each task (Habash and Rambow, 2005;Pasha et al., 2014;Shahrour et al., 2015).