YOU SAID:
Hello I'm 17 years old
INTO JAPANESE
こんにちは私は17歳です
BACK INTO ENGLISH
Hi I am 17 years old
INTO JAPANESE
こんにちは、私は17歳です
BACK INTO ENGLISH
Hello, I am 17 years old
INTO JAPANESE
こんにちは、私は17歳です
BACK INTO ENGLISH
Hello, I am 17 years old
You've done this before, haven't you.