we haven't tried this before
we have try this before
pro:sub aux part det:dem adv
we haven't tried this before .
w iː WORD_BOUNDARY h æ v ə n t WORD_BOUNDARY t ɹ aɪ d WORD_BOUNDARY ð ɪ s WORD_BOUNDARY b ɪ f oː ɹ WORD_BOUNDARY
w e WORD_BOUNDARY h a v e n ' t WORD_BOUNDARY t r i e d WORD_BOUNDARY t h i s WORD_BOUNDARY b e f o r e WORD_BOUNDARY