is often assimilated to . Speakers from the Yucatan, especially men or those who are older, often pronounce the voiceless stops with aspiration. Vowels Like most Spanish dialects and varieties, Mexican Spanish has five vowels: close unrounded front , close rounded back , mid unrounded front , mid rounded back , and open unrounded . A striking feature of Mexican Spanish, particularly that of central Mexico, is the high rate of reduction, which can involve shortening and centralization, devoicing, or both, and even elision of unstressed vowels, as in (, 'cooking utensils'). This process is most frequent when a vowel is in contact with the phoneme , so that + vowel + is the construction when the vowel is most frequently affected. It can be the case that the words , , and are pronounced the same . The vowels are slightly less frequently reduced or eliminated in the constructions + vowel + , so that the words , , and may also be pronounced the same . Morphology Mexican Spanish is a form of the language (i.e. using and its traditional verb forms for the familiar second person singular). The traditional familiar second person plural pronoun —in colloquial use only in Spain—is found in Mexico only in certain archaic texts and ceremonial language. However, since it is used in many Spanish-language Bibles throughout the country, most Mexicans are familiar with the form and understand it. An instance of it is found in the national anthem, which all Mexicans learn to sing: . Mexicans tend to use the polite personal pronoun in the majority of social situations, especially in Northern Mexico. In the north, children even address their parents with . In rural areas of Sonora, Chihuahua, Durango, Jalisco, Guanajuato, and Tlaxcala, many people use a number of distinct non-standard morphological forms: 2nd person preterite verb forms ending in , imperfect forms such as instead of 'brought, believed', a merger of and verb conjugations such that 'we live' is instead of , verb roots other than with non-standard such as 'I believe' for , an accent shift in the first person plural subjunctive forms instead of 'we go', and a shift from to in proparoxytonic third person singular verb forms ( instead of 'we sing'). These same verb forms are also found in the traditional Spanish of northern New Mexico and southern Colorado. Suffixes Central Mexico is noted for the