I would like to know the difference between these words, please write some example sentences.

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    Possible Duplicate: ひらく / とじる vs. あける / しめる – Flaw Aug 20 '16 at 15:52
  • ^That link is helpful but I don't think it answers the question. Unless I'm missing something it just says that the two are used differently without saying why. – user3856370 Aug 20 '16 at 16:07
  • @user3856370 I rather think the accepted answer in that link tells sufficiently how and why they're different, and becomes a superset of what needs to be answered here. – broccoli facemask - cloth Aug 21 '16 at 16:41
  • @broccoliforest Your right. I guess I was getting confused with how you know when to use あく or あける for example when they can both be transitive and intransitive. – user3856370 Aug 21 '16 at 16:47

As in Flaw's comment, あく is intransitive and ひらく can be both. The transitive form of あく is 開ける(あける). And don't confuse 開くwith 空く(あく)which means to become vacant.

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開く(あく)to be opened

その店は開く This shop is opened

開く(ひらく)to open

私は窓を開く I open a window

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  • 2
    It seems your answer tries to distinguish them by transitivity. However, ひらく can be transitive or intransitive while あく is intransitive. – Flaw Aug 20 '16 at 15:54

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