or a marketplace would say respectively Vou ao banco, Vou ao supermercado or Vou à feira. Crasis also occurs between the preposition a and demonstrative such as when the preposition precedes aquele(s), aquela(s) (meaning "that", "those", in different genders), which contract to àquele(s), àquela(s). The accent marks a secondary stress in Portuguese. In addition, the crasis à is pronounced lower as than the article or preposition a, as , in the examples in standard European Portuguese, but the qualitative distinction is not made by most speakers in Brazilian Portuguese (some dialects, like Rio de Janeiro's fluminense, are exceptions and make the distinction). Crasis is very important since it can change the meaning of a sentence: Exposta, a polícia - The police is exposed Exposta à polícia - She is exposed to the police Glória, a rainha - Glória the queen Glória à rainha - Glory to the queen Dê a mulher - Give the woman Dê à mulher - Give to the woman These rules determine whether crasis always applies or whether one may use the contraction à (with an accent) instead of the preposition a (without an accent): Replace the preposition a by another preposition, as em ("in") or para ("to"). If after replacement, the definite article a ("the") is still possible, crasis applies: Pedro viajou à Região Nordeste: with a grave accent because it equivalent to "Pedro traveled 'to the' Northeast Region". Here, para a Região Nordeste could also be used. O autor dedicou o livro a sua esposa: without a grave accent in Brazilian Portuguese because it is equivalent to "The author dedicated the book 'to' his wife". A consistent use, according to the rules in Brazil would not allow para a sua esposa to be used instead. In European Portuguese, the rules are different, and it is O autor dedicou o livro à sua esposa, but in English, both sentences have the same meaning. If the nominal complement is changed after "a" from a feminine noun to a masculine noun, and it is now necessary to use 'ao' as used naturally by native speakers, crasis applies: Prestou relevantes serviços à comunidade, He/she paid outstanding services to the community: with a grave accent because if the object is changed to a masculine noun ("Prestou relevantes serviços ao povo" He/she paid outstanding services to the people), "ao" ("to [masculine] the") is now used. "Chegarei daqui a uma hora"