when did that happen again
when do that happen again
conj v comp v adv
when did that happen again?
w e n WORD_BOUNDARY d ɪ d WORD_BOUNDARY ð æ tʰ WORD_BOUNDARY h æ pʰ ə n WORD_BOUNDARY ɐ ɡ e n WORD_BOUNDARY
w h e n WORD_BOUNDARY d i d WORD_BOUNDARY t h a t WORD_BOUNDARY h a p p e n WORD_BOUNDARY a g a i n ? WORD_BOUNDARY