I don't know what happened to the book
I do know what happen to the book
pro:sub mod v pro:int v prep det:art n
i don't know what happened to the book .
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY w ʌ t WORD_BOUNDARY h æ p ə n d WORD_BOUNDARY t ə WORD_BOUNDARY ð ə WORD_BOUNDARY b ʊ k WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY w h a t WORD_BOUNDARY h a p p e n e d WORD_BOUNDARY t o WORD_BOUNDARY t h e WORD_BOUNDARY b o o k WORD_BOUNDARY