YOU SAID:

I cannot believe that your aunt is a lesbian.

INTO JAPANESE

私はあなたの叔母さんがレズビアンだとは信じられません。

BACK INTO ENGLISH

I can't believe your aunt is a lesbian.

INTO JAPANESE

あなたの叔母さんがレズビアンだなんて信じられない。

BACK INTO ENGLISH

I can't believe your aunt is a lesbian.