> おばあさん は 川（かわ） へ せんたく に でかけます。

Why is there both へ and に? When can they be used together? Can someone break
down the sentence for me to understand?
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2012-03-28T07:04:21.170
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2012-03-28T09:08:20.960
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particle-に particle-へ
When are へ and に used together?
The に you presented indicates purpose of going rather than a direction.

Related: [Is it true that only movement verbs can take [V-stem]に to express a
purpose?](https://japanese.stackexchange.com/q/2957/542)

Constituent parts:

  * おばあさんは(The woman(topic)) 

  * 川へ(in the direction of river) 

  * せんたくしに(for the purpose of laundry) 

  * でかけます(go out)

Sentence: The woman goes out to the river to do laundry.
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2012-03-28T07:24:21.567
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2012-03-28T07:55:33.243
2017-04-13T12:43:44.207
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As far as I know it's fine to use に after both verb stems and nouns when given
as reasons for something.

E.g. お土産に買う - I will buy it as a souvenir

And to give a more concrete answer to your question: The particles convey
different information, one is direction and the other is reason. Of course you
can't have two directions, but that is not the case here.
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2012-03-28T08:36:23.030
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2012-03-28T09:08:20.960
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