YOU SAID:
How's your birthday is that you are the best friend
INTO JAPANESE
あなたの誕生日は、あなたが親友だということです
BACK INTO ENGLISH
Your birthday is that you are my best friend.
INTO JAPANESE
あなたの誕生日は、あなたが私の親友だということです。
BACK INTO ENGLISH
Your birthday is that you are my best friend.
This is a real translation party!