1. why
  2. how
  3. when
  4. what
  5. where

CEDICT

  1. (obsolete on its own in Standard Chinese) why; what; where; how; when
  2. why; what; where; how; when

Wiktionary

  1. 什麼時候
  2. 為何
  3. 何不
  4. 難道

重編國語辭典

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