YOU SAID:

It is impossible to say how first the idea entered my brain

INTO JAPANESE

アイデアが最初に私の脳に入った方法を言うことは不可能です

BACK INTO ENGLISH

It's impossible to say how the idea first got into my brain

INTO JAPANESE

アイデアが最初に私の頭に浮かんだ方法を言うことは不可能です

BACK INTO ENGLISH

It's impossible to say how the idea first came to my mind

INTO JAPANESE

そのアイデアが最初に頭に浮かんだ理由を言うことは不可能です

BACK INTO ENGLISH

It's impossible to say why the idea first came to mind

INTO JAPANESE

なぜそのアイデアが最初に頭に浮かんだのかを言うことは不可能です

BACK INTO ENGLISH

It's impossible to say why the idea first came to mind