that's the hardest part
that the hard part
pro:dem det:art adj n
that's the hardest part.
ð æ t s WORD_BOUNDARY ð ə WORD_BOUNDARY h ɑ ɹ d ɪ s t WORD_BOUNDARY p ɑ ɹ t WORD_BOUNDARY
t h a t ' s WORD_BOUNDARY t h e WORD_BOUNDARY h a r d e s t WORD_BOUNDARY p a r t . WORD_BOUNDARY