Why is answer A (遊べるために) wrong in this question?


[![Textbook
questions](https://i.stack.imgur.com/hMxs8.jpg)](https://i.stack.imgur.com/hMxs8.jpg)

この公園には[a. 子供が遊べる/b. 子供が遊ぶ]ために、ブランコが設置してある。

I thought of "A swing is installed in order for children to be able to play in
this park", but apparently that's wrong but I can't figure out why.

I see why B is correct but I don't get why A would be wrong.




子供が遊べるために sounds awkward to me. I think we usually say:

  * potential form + ように 
  * plain form + ために

to mean "so that ~~ can do ~~" / "for the purpose of ~~".

So in your example I think you could say:

  * 子供が遊 **べるように** ( _lit._ so that children can play with it) 
  * 子供が遊 **ぶために** ( _lit._ for children to play with it)

Some examples:

>   * [東大]{とうだい}に[入]{はい} **れるように** [一生懸命]{いっしょうけんめい}[勉強]{べんきょう}する。  
>  (I'll study hard so that I can enter Tokyo University.)
>   * 東大に入 **るために** 一生懸命勉強する。  
>  (I'll study hard in order to enter Tokyo University.)
>




子供が遊べるために sounds awkward to me. I think we usually say:

  * potential form + ように 
  * plain form + ために

to mean "so that ~~ can do ~~" / "for the purpose of ~~".

So in your example I think you could say:

  * 子供が遊 **べるように** ( _lit._ so that children can play with it) 
  * 子供が遊 **ぶために** ( _lit._ for children to play with it)

Some examples:

>   * [東大]{とうだい}に[入]{はい} **れるように** [一生懸命]{いっしょうけんめい}[勉強]{べんきょう}する。  
>  (I'll study hard so that I can enter Tokyo University.)
>   * 東大に入 **るために** 一生懸命勉強する。  
>  (I'll study hard in order to enter Tokyo University.)
>

