The rules of pronunciation for all the Celtic languages are extremely complicated. For example, the final sound of a word frequently brings about a phonetically changed initial consonant of the next word, as in Irish fuil, "blood," but ar bhfuil, "our blood." Another example is Welsh pen, "head," but fy mhen, "my head." In order to look up a word in the dictionary, one has to be familiar with these rules of phonetic change, or mutation. There are only two genders in the Celtic languages, masculine and feminine. Words of Celtic origin that have been absorbed by English include bard, blarney, colleen, crock, dolmen, druid, glen, slogan, and whiskey. An interesting feature of Celtic languages is that in several characteristics they resemble some non-Indo-European languages. These characteristics include the absence of a present participle and the use instead of a verbal noun (found also in Egyptian and Berber), the frequent expression of agency by means of an impersonal passive construction instead of by a verbal subject in the nominative case (as in Egyptian, Berber, Basque, and some Caucasian and Eskimo languages), and the positioning of the verb at the beginning of a sentence (typical of Egyptian and Berber).