YOU SAID:
Hi I'm Karl and my best friend is Isabella!
INTO JAPANESE
こんにちは、カールです。私の親友はイザベラです!
BACK INTO ENGLISH
Hello, I'm Carl. Isabella is my best friend!
INTO JAPANESE
こんにちは、カールです。イザベラは私の親友です!
BACK INTO ENGLISH
Hello, I'm Carl. Isabella is my best friend!
That didn't even make that much sense in English.