está a bater à porta
está a bater à porta ?
e s t a WORD_BOUNDARY ɐ WORD_BOUNDARY b ɐ t e ɹ WORD_BOUNDARY aː WORD_BOUNDARY p ɔ ɾ ə t ɐ WORD_BOUNDARY
e s t á WORD_BOUNDARY a WORD_BOUNDARY b a t e r WORD_BOUNDARY à WORD_BOUNDARY p o r t a WORD_BOUNDARY