He is reading a book.
Meaning: This means that a male person is looking at and understanding the words and information in a book.
Choice of Words: Reading means looking at and understanding written or printed words. Book is a set of pages that are bound together and contain information or a story. He refers to a male person. When you put them together, "He is reading a book" is a description of a male person looking at and understanding written or printed words in a book.
Alternative Expressions
Related Expressions