YOU SAID:

It will be the most 1? important thing to has

INTO JAPANESE

それは最も重要な1つです

BACK INTO ENGLISH

It is the most important one

INTO JAPANESE

それは最も重要なものです

BACK INTO ENGLISH

It's the most important thing

INTO JAPANESE

それは最も重要なことだ

BACK INTO ENGLISH

That's the most important thing

INTO JAPANESE

それが最も重要なことだ

BACK INTO ENGLISH

That's the most important thing