Question

Ma sœur a trouvé quelque chose dans le cave.

Hint:

Use “ne … rien” for “quelque chose” and remember: in compound tenses, “rien” comes after the auxiliary verb.

Answer 1

“Quelque chose” means “something.” Its negative counterpart is “ne … rien” (nothing).
“Rien” must come after the auxiliary “a.”
Also, note: “le cave” should be “la cave” (feminine noun).
So the correct sentence is: Ma sœur n’a rien trouvé dans la cave.