 The dual form is identical in form to the dative singular; depending on noun class, the dual is therefore either the same in form as the common singular (the nominative-accusative, Class 1 nouns, Class 3 and Class 4 nouns), or have a palatalised final consonant in nouns of Class 2 and Class 5.Plurals are formed in a variety of ways, including suffixation (often involving the suffix "-(e)an") and slenderisation.Pluralisation, as in Irish Gaelic and Manx, can vary according to noun class, however on the whole depends on the final sound of the singular form.