YOU SAID:

my favourite thing to do in the world ever is nothing

INTO JAPANESE

世界で一番好きなことは何でもない

BACK INTO ENGLISH

Nothing is my favorite thing in the world.

INTO JAPANESE

世界で一番好きなものは何もない。

BACK INTO ENGLISH

There is nothing in the world that I like best.

INTO JAPANESE

私が一番好きなものは世界にはない。

BACK INTO ENGLISH

There is no thing in the world that I like best.

INTO JAPANESE

私が一番好きなものは世界にはない。

BACK INTO ENGLISH

There is no thing in the world that I like best.