I wonder how that happened
i wonder how that happened.
aɪ WORD_BOUNDARY w ʌ n d ə ɹ WORD_BOUNDARY h aʊ WORD_BOUNDARY ð æ t WORD_BOUNDARY h æ p ə n d WORD_BOUNDARY
i WORD_BOUNDARY w o n d e r WORD_BOUNDARY h o w WORD_BOUNDARY t h a t WORD_BOUNDARY h a p p e n e d . WORD_BOUNDARY