when is his birthday
when be his
conj aux det:poss
when is his birthday ?
w ɛ n WORD_BOUNDARY ɪ z WORD_BOUNDARY h ɪ z WORD_BOUNDARY b ɜː θ d eɪ WORD_BOUNDARY
w h e n WORD_BOUNDARY i s WORD_BOUNDARY h i s WORD_BOUNDARY b i r t h d a y WORD_BOUNDARY