YOU SAID:
the world is more beautiful with you in it
INTO JAPANESE
あなたがいると世界はもっと美しくなります
BACK INTO ENGLISH
The world is more beautiful with you
INTO JAPANESE
あなたがいれば世界はもっと美しくなる
BACK INTO ENGLISH
The world will be more beautiful if you are here
INTO JAPANESE
君がいれば世界はもっと美しくなる
BACK INTO ENGLISH
The world will be more beautiful if you are here
That didn't even make that much sense in English.