i know that "開ける" involves subject and object, like :

"窓を開けました"( windows opened, & implied someone did it ),

and "開く(あく)" only involves the subject, like :

"窓が開きました" ( windows opened, & implied no one, maybe by wind blow ),

but i can't make it very clear if "開く(ひらく)" is similar or equal to "開ける(あける)" which i found only very few examples says so.

  • ひらく is both intransitive/transitive. 「窓がひらく。」 = "The window opens." 「窓をひらく。」= "(Someone) opens the window." And your second example has a typo. It should be 窓開きました, because the subject must be marked with が. – naruto Jul 21 '17 at 7:06
  • @naruto thx for the correction~ – ioojimooi Jul 21 '17 at 7:14

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