YOU SAID:
I am reading a Harry Potter book.
INTO JAPANESE
私はハリー・ポッターの本を読んでいます。
BACK INTO ENGLISH
I'm reading Harry Potter books.
INTO JAPANESE
ハリー・ポッターの本を読んでいます。
BACK INTO ENGLISH
I'm reading Harry Potter books.
You've done this before, haven't you.