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In the following sentence, why 'は’, not 'を’、is used as 格助詞？？

> 私は借りたお金 **は** すぐ返します。
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2017-08-15T04:36:48.437
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2017-08-15T05:55:38.477
2017-08-15T04:55:34.293
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grammar particle-は
は is used for Objective 格助詞
The particle は can be combined with numerous other particles. For example, you
may have already seen things like

> で＋は＝では  
>  と＋は＝とは

However, in certain situations, the combination gets reduced as in

> を＋は＝は

Similarly

> が＋は＝は

These are the only two cases I know of where the joined particle gets fully
absorbed into は.

So the speaker wanted to say something like

> 私は借りたお金をはすぐ返します

But, in modern Japanese this isn't grammatical and the をは becomes just plain
は.

In older documents (or documents using an older style of writing) をは isn't
necessarily reduced in this manner but becomes をば instead. And, occasionally
this pops up in some dialects.
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2017-08-15T04:42:10.667
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2017-08-15T04:48:51.843
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> In the following sentence, why 'は’, not 'を’、is used as 格助詞？？
>

>> 私は借りたお金 **は** すぐ返します。

No, the は is not a 格助詞. I say it's indicating the second topic/subject of the
predicate, すぐ返します.
CC BY-SA 3.0
2017-08-15T05:55:38.477
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2017-08-15T05:55:38.477
2020-06-17T08:18:27.500
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answer