YOU SAID:

My sister thinks im stupid

INTO JAPANESE

妹考えてイム愚かです

BACK INTO ENGLISH

My sister is stupid IM

INTO JAPANESE

私の妹は愚かな IM

BACK INTO ENGLISH

My sister is IM stupid.

INTO JAPANESE

姉は、私は愚かです。

BACK INTO ENGLISH

My sister is stupid I was.

INTO JAPANESE

私の妹は私は愚かです。

BACK INTO ENGLISH

My sister is stupid I was.