YOU SAID:
What is your favorite thing to do on a rainy day.
INTO JAPANESE
雨の日に好きなことは何ですか。
BACK INTO ENGLISH
What is your favorite thing on a rainy day?
INTO JAPANESE
雨の日に一番好きなものは?
BACK INTO ENGLISH
What is your favorite thing on a rainy day?
That didn't even make that much sense in English.