YOU SAID:

My older sister in a dunce for saying that

INTO JAPANESE

言って劣等生の姉

BACK INTO ENGLISH

Say sister dunce

INTO JAPANESE

言う姉妹劣等生

BACK INTO ENGLISH

Tell sister dunce

INTO JAPANESE

妹に言う劣等生

BACK INTO ENGLISH

My sister says dunce

INTO JAPANESE

姉は劣等生

BACK INTO ENGLISH

My sister is a dunce.

INTO JAPANESE

私の妹は、劣等生です。

BACK INTO ENGLISH

My sister is a dunce.