I've not heard that before
I not hear that before
pro:sub neg part comp adv
i've not heard that before .
aɪ v WORD_BOUNDARY n ɒ t WORD_BOUNDARY h ɜː d WORD_BOUNDARY ð a t WORD_BOUNDARY b ɪ f ɔː WORD_BOUNDARY
i ' v e WORD_BOUNDARY n o t WORD_BOUNDARY h e a r d WORD_BOUNDARY t h a t WORD_BOUNDARY b e f o r e WORD_BOUNDARY