YOU SAID:

I've only read this book halfway through

INTO JAPANESE

私はこの本を途中で読んだだけです

BACK INTO ENGLISH

I just read this book on the way

INTO JAPANESE

途中でこの本を読んだ

BACK INTO ENGLISH

I read this book on the way

INTO JAPANESE

途中でこの本を読みました

BACK INTO ENGLISH

I read this book on the way