iiKanji: learning the readings of the kanji

yudantaiteki Wrote:What's wrong with 本が開いた? Also I've never said 本をひらく, I just use あける with that.

http://nihognodaybydayenglish.blogspot.c...iraku.html

EDIT:
according to this document the following is correct:

本をひらく(open a book)
本がひらく(book opens)

I guess 開く（ひらく）can be used both in transitive and intransitive way.
Read the link for the explanation as to why ひらく is correct.