勉強ばできん - particle ば


In Gabaibaachan, in ch. 15, at a climax in the story, the protagonist's mother
finally makes an appearance and cheers him on at a running race. He calls
back:

> 勉強ばできんばってん足が早かろうが--!

"I'm a terrible student but I'm a good runner, aren't I?"

My question is what the ば particle is doing there. It seems to replace が. Is
this a common feature of Sagaben?

Edit:

After reading the comments below, I realise ば can replace を in the 九州 dialect.
After googling をできない, I found some examples of this collocation, even though I
would have expected ができない. So, my updated question is, is the character in
fact saying, 「勉強(が)をできない」?




> 勉強 **ば** できんばってん足が早かろうが--!  
>  _I've a bad brain (or I'm not smart) but I'm a good runner, aren't I?_

In this sentence ば stands for は, a topic marker, in がばいばあちゃん's region in Saga
prefecture. It is a common Kyushu dialect. As for the ば in the following
sentence also by がばいばあちゃん written
[here](https://japanese.stackexchange.com/questions/46744/why-is-%E3%81%B0-in-
this-sentence) stands for を.

> そんなトコで何 **ば** しよる。  
>  _What are you doing there?_

I don't know why, but ば is flexible in the dialect.




> 勉強 **ば** できんばってん足が早かろうが--!  
>  _I've a bad brain (or I'm not smart) but I'm a good runner, aren't I?_

In this sentence ば stands for は, a topic marker, in がばいばあちゃん's region in Saga
prefecture. It is a common Kyushu dialect. As for the ば in the following
sentence also by がばいばあちゃん written
[here](https://japanese.stackexchange.com/questions/46744/why-is-%E3%81%B0-in-
this-sentence) stands for を.

> そんなトコで何 **ば** しよる。  
>  _What are you doing there?_

I don't know why, but ば is flexible in the dialect.

