I don't have to do it
I do have to do it
pro:sub mod v inf v pro:per
i don't have to do it .
aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY h æ v WORD_BOUNDARY t ə WORD_BOUNDARY d uː WORD_BOUNDARY ɪ t WORD_BOUNDARY
i WORD_BOUNDARY d o n ' t WORD_BOUNDARY h a v e WORD_BOUNDARY t o WORD_BOUNDARY d o WORD_BOUNDARY i t WORD_BOUNDARY