YOU SAID:

this is going to be a very good day!

INTO JAPANESE

これは非常に良い一日になるだろう!

BACK INTO ENGLISH

This is going to be a very good day!

INTO JAPANESE

これはとても良い日になるでしょう！

BACK INTO ENGLISH

This will be a very good day!

INTO JAPANESE

これはとても良い日です！

BACK INTO ENGLISH

This is a very good day!

INTO JAPANESE

これは非常に良い一日です!

BACK INTO ENGLISH

This is a very good day!