if you don't know how
if you do know how
conj pro:per mod v pro:rel
if you don't know how .
ɪ f WORD_BOUNDARY j uː WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY h aʊ WORD_BOUNDARY
i f WORD_BOUNDARY y o u WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w WORD_BOUNDARY h o w WORD_BOUNDARY