How to pronounce 有所不知 in Cantonese (8 out of 8):

唉 ngoi1

interjection or grunt of agreement or recognition (e.g. yes, it's me!)

to sigh

alas

你 nei5

you (informal, as opposed to courteous 您nín [您])

can be used to refer to an unspecified person

有所不知 jau5 so2 bat1 zi1

may not know; to not know something