YOU SAID:

grammar is so useless that it doesn't matter

INTO JAPANESE

文法はあまり役に立たないことそれは問題ではないです。

BACK INTO ENGLISH

Is not grammar is so useless that it is a problem.

INTO JAPANESE

文法はあまり役に立たないそれは問題はありません。

BACK INTO ENGLISH

Grammar is useless so it doesn't matter.

INTO JAPANESE

文法は、問題ではないので役に立たないです。

BACK INTO ENGLISH

Grammar problem is now not so useless.

INTO JAPANESE

文法問題はないので役に立たないです。

BACK INTO ENGLISH

It is useless since there is no grammatical problem.

INTO JAPANESE

文法的な問題がないので役に立たないです。

BACK INTO ENGLISH

It is useless because there is no grammatical problem.

INTO JAPANESE

それは文法的な問題がないので役に立たない。

BACK INTO ENGLISH

It is useless because it has no grammatical problem.

INTO JAPANESE

それは文法上の問題がないので役に立たない。

BACK INTO ENGLISH

It is useless because it has no grammatical problem.