他在读书。

He is reading a book.

He is reading books.

Source: Tatoeba

Sentence Composition

1 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
2 在读 zàidú to be studying (at a school or research institute)
=3 书 Shū abbr. for 书经 Shūjīng
=3 书 shū
  1. book
  2. letter
  3. document
  4. to write

classifiers: 本, 冊, 部