The present article deals with the raising [o] > [u] and [e] > [i] in pretonic guideline in
the dialect of the rural area of the city of Breves-PA. Considered as changeable occurrences, had been
analyzed given such as [boneca] in the place of [buneca]; as well as the ones of the type [mininu] in
the place of [meninu]. It was objectified to also verify the conditionings of this variation, in the
perspective of the possibility of interference of the tonic vowel, when this will be high, what he has
been called for studious the Portuguese of Brazil of vowel harmony. The used data counted on stories
of 36 informers born in the locality, totalizing 2624 data of occurrence or not-occurrence of the
studied phenomenon. The support for the data processing is represented by the package of statistical
programs Varbrul. The results had shown that the presence of the contiguous vowel /i/ or /u/
syllabifies it daily pretonic favors the application of the rule, as well as, therefore how much lesser in
the distance in the distance bigger the possibility of occurrence of the phenomenon. In that it says
respect to the grammatical class, the nominal suffixes and the diminutive ones if had presented
supporters of the application of the rule Finally is possible to say that in relation factors social, the
schoolarity also if showed supporter of application of rule, for the fact of that more they study less to
high up of than those that they possess few years of study or they had not frequented the school, as
well as the informers older than they high up more of the one that more the young. The research also
showed a bigger presence of the middle high vowels in detriment of the middle low.
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