por que (preposition por + pronoun que) = question in the beginning of the sentence example por que vocêeu todo o bolo ?
por quê (preposition por + pronoun quê) = question in the end of the sentence example vocêeu todo o bolo por quê?
porque (conjuction because) = answer in the beginning of the sentence example: eui todo o bolo porque estava fome
porquê (adverb why) = answer in the end of when you refer to the reason
notice that porquê is also a masculine noun, "reason, cause"
tip: when used in question, write por + que/quê apart and when answering, write together. write que with an accent when it is used in the end of sentence. notice however the different meanings of the words.
asking politely
em português in english poderia me dizer ……? could you tell me ……?
poderia to be able to , can look irregular verbs poder dizer to say irregular verbs dizer
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