YOU SAID:

Erasers aren't always on pencils but pencils are always on erasers which means that pencils don't always have erasers but they still are pencils that have no erasers that have erasers on pencils.

INTO JAPANESE

消しゴムは常に鉛筆にあるわけではありませんが、鉛筆は常に消しゴムにあります。つまり、鉛筆には常に消しゴムがあるとは限りませんが、鉛筆に消しゴムがある消しゴムがない鉛筆です。

BACK INTO ENGLISH

The eraser is not always on the pencil, but the pencil is always on the eraser. In other words, pencils don't always have an eraser, but pencils have an eraser and no eraser.

INTO JAPANESE

消しゴムは常に鉛筆の上にあるとは限りませんが、鉛筆は常に消しゴムの上にあります。つまり、鉛筆には常に消しゴムがあるとは限りませんが、鉛筆には消しゴムがあり、消しゴムはありません。

BACK INTO ENGLISH

The eraser is not always on the pencil, but the pencil is always on the eraser. That is, pencils do not always have an eraser, but pencils have an eraser and no eraser.

INTO JAPANESE

消しゴムは常に鉛筆の上にあるとは限りませんが、鉛筆は常に消しゴムの上にあります。つまり、鉛筆には常に消しゴムがあるとは限りませんが、鉛筆には消しゴムがあり、消しゴムはありません。

BACK INTO ENGLISH

The eraser is not always on the pencil, but the pencil is always on the eraser. That is, pencils do not always have an eraser, but pencils have an eraser and no eraser.