I've worked on it
I work on it
pro:sub part prep pro:per
i've worked on it.
aɪ v WORD_BOUNDARY w ɜː k t WORD_BOUNDARY ɔ n WORD_BOUNDARY ɪ t WORD_BOUNDARY
i ' v e WORD_BOUNDARY w o r k e d WORD_BOUNDARY o n WORD_BOUNDARY i t . WORD_BOUNDARY