41179
[![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.
CC BY-SA 3.0
2016-11-24T21:18:50.560
41176
2016-11-25T01:41:11.957
2016-11-25T01:14:52.597
542
18778
question
grammar verbs
Why is answer A (遊べるために) wrong in this question?
I agree with you. A seems to be as good as B.  
The only detail I can think of is one of logic, not grammar.  
If the swing is there so children CAN play, does it mean that children CANNOT
play without the swing? That is not true. Children can still play even without
the swing.  
If you say 子供が遊べる, it means that children cannot play without the swing, which
is not true.
CC BY-SA 3.0
2016-11-24T21:43:56.647
41177
2016-11-24T21:43:56.647
18157
41176
answer
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.)
>
CC BY-SA 3.0
2016-11-24T23:48:48.823
41179
2016-11-25T01:41:11.957
2016-11-25T01:41:11.957
9831
9831
41176
answer