YOU SAID:

I have very good grammar, but this thing will ruin it

INTO JAPANESE

私は非常に良い文法がこいつはそれを台無しに

BACK INTO ENGLISH

I have very good grammar is it ruined

INTO JAPANESE

私はそれは非常に良い文法がある台無しに

BACK INTO ENGLISH

I have a very good grammar it is ruined

INTO JAPANESE

私はそれを台無しには非常に良い文法があります。

BACK INTO ENGLISH

To mess with it I will have very good grammar.

INTO JAPANESE

それを台無しに、私は非常に良い文法が。

BACK INTO ENGLISH

To mess with it I will have very good grammar.