I hadn't heard that
I have hear that
pro:sub aux part comp
i hadn't heard that.
aɪ WORD_BOUNDARY h æ d ə n tʰ WORD_BOUNDARY h ɜː d WORD_BOUNDARY ð æ tʰ WORD_BOUNDARY
i WORD_BOUNDARY h a d n ' t WORD_BOUNDARY h e a r d WORD_BOUNDARY t h a t . WORD_BOUNDARY