read a book 或者read books,read story 或者read stories,reading books, reading a book.....read it is a book不对,最后一句是想表达什么?it is a reading book.
你要表达什么?read book,读书,read the story,读这个故事,reading book,正在读书,绝对正确,后面那个?it前面加个逗号才读的通,不过我只是3级,可能4级有比较口语的说法。