Help with "My little sister can't run this fast" in the style of ～こんなに～わけがない


Newcomer in the Japanese stackexchange. :) My knowledge in the language is
fairly limited and I need your help.

I'd like to know how is " ** _My little sister can't run this fast_** " in
Japanese? Different online translations give different variations. I don't
know how correct or "stiff" they are.

And if you're wondering, there's an anime " _My little sister can't be this
cute"(Ore no imouto ga konnani kawaii wake ga nai)_ [俺の妹がこんなに可愛いわけがない]. All
the episodes are titled "my little sister can't ...". So I'd like the
**closest** translation to the anime title.

Here's what I know:

Ore no - my

imouto - little sister

ga - is (when new info is introduced)

konnani - in this way

kawaii - cute

wake - being

ga - is (when new info is introduced) but why twice?

nai - negative particle

And I expect it to be something like this: _Ore no imouto ga konnani hayaku ga
hashiranai_

P.S. Also, could you provide the correct sentence in Japanese hieroglyphs, as
well? Onegai.

**_EDIT:_**

Thank you both for the thorough explanations. :)

And I didn't know that Japanese symbols are not called "hieroglyphs" at all.
English is not my native language. Maybe the term is most suitable for ancient
writing systems.




The most literal translation of this title would be:

> There is no way my little sister is this cute.

The _is_ in the above sentence is not really grammatical and should be
understood as _can be_.

Just mimicking the title of the anime you get:

(hashiru : run ; hayaku : fast)

>
> おれ{ore}の{no}い{i}も{mo}う{u}と{to}が{ga}こ{ko}ん{n}な{na}に{ni}は{ha}や{ya}く{ku}は{ha}し{shi}る{ru}わ{wa}け{ke}が{ga}な{na}い{i}。  
>  俺の妹がこんなに速く走るわけがない。  
>  My little sister can't run this fast

* * *

First が{ga} is not _is_ but が tells you that what is just before が is the
subject of the sentence. Here there are two が because two sentences are
intertwined.

> 1: 俺の妹がこんなに可愛い  
>  1: My little is this cute.
>
> 2: ～わけがない  
>  2: No way ～ is true.

Combining the two: No way (the fact that) _my little sister is this cute_ is
true which translates more properly to _My little sister can't be this cute_




The most literal translation of this title would be:

> There is no way my little sister is this cute.

The _is_ in the above sentence is not really grammatical and should be
understood as _can be_.

Just mimicking the title of the anime you get:

(hashiru : run ; hayaku : fast)

>
> おれ{ore}の{no}い{i}も{mo}う{u}と{to}が{ga}こ{ko}ん{n}な{na}に{ni}は{ha}や{ya}く{ku}は{ha}し{shi}る{ru}わ{wa}け{ke}が{ga}な{na}い{i}。  
>  俺の妹がこんなに速く走るわけがない。  
>  My little sister can't run this fast

* * *

First が{ga} is not _is_ but が tells you that what is just before が is the
subject of the sentence. Here there are two が because two sentences are
intertwined.

> 1: 俺の妹がこんなに可愛い  
>  1: My little is this cute.
>
> 2: ～わけがない  
>  2: No way ～ is true.

Combining the two: No way (the fact that) _my little sister is this cute_ is
true which translates more properly to _My little sister can't be this cute_

