YOU SAID:

Hi, I am a smart person

INTO JAPANESE

こんにちは、私はスマートな人

BACK INTO ENGLISH

Hi, I was a smart person

INTO JAPANESE

こんにちは、私は頭の良い人がいた

BACK INTO ENGLISH

Hi, I had a good head

INTO JAPANESE

こんにちは、私は頭がいいがいた

BACK INTO ENGLISH

Hello, I better head was

INTO JAPANESE

こんにちは、私は頭が良いが

BACK INTO ENGLISH

Hi, my head is good

INTO JAPANESE

こんにちは、私の頭は良い

BACK INTO ENGLISH

Hi, my head is good