YOU SAID:

人形を義姉さんだと思い込んでいる

INTO JAPANESE

人形を義姉さんだと思い込んでいる

BACK INTO ENGLISH

I assume that the doll is my sister-in-law.

INTO JAPANESE

私は人形が私の義理の妹であると仮定します。

BACK INTO ENGLISH

I assume the doll is my sister-in-law.

INTO JAPANESE

人形は私の義理の妹だと思います。

BACK INTO ENGLISH

I think the doll is my sister-in-law.

INTO JAPANESE

人形は私の義理の妹だと思います。

BACK INTO ENGLISH

I think the doll is my sister-in-law.