不知所以 bù zhī suǒ yǐ

DEFINITIONS

  1. to not know the reason
  2. to not know what to do

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
知 zhī
HSK 2
know, perceive, comprehend
所 suǒ
HSK 2
place, location; numerary adjunct
以 yǐ
HSK 2
by means of; thereby, therefore; consider as; in order to